# LSI Water Service Logbook/Plan — Pool & Spa Balance Planner

> Pool water chemistry calculator for Langelier Saturation Index. (iPhone/iPad app by Verosocial Studio.)

- Source: https://appshunter.io/ios/app/lsi-water-service-logbookplan/id373769371 (this page in markdown: same URL + `.md`)
- Developer: [Verosocial Studio](https://appshunter.io/developer/354566841)
- Category: Utilities, Business
- Price: Free with in-app purchases (on sale, was $0.99)
- Age rating: 4+
- Requires: iOS 17.6 · 5 MB
- Languages: American English
- Released: 2010-05-27
- Data updated: 2026-08-21
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/lsi-water-service-logbookplan/id373769371/reviews.md

## What is LSI Water Service Logbook/Plan?

You take water care seriously, and that kind of steady service deserves tools that keep up. Thank you for using LSI Water Service Log to calculate LSI, save pool and spa readings, and keep clear records for every stop.

LSI Water Service Log is a practical pool service app for anyone who checks water chemistry, tracks site history, and needs fast records without a messy paper trail. It brings a Langelier Saturation Index calculator, pool and spa water balance log, site records, quick review tools, and export options into one focused app.

Built for real service days:

- Calculate LSI from TDS, temperature, calcium hardness, total alkalinity, and measured pH.
- See water balance feedback for corrosive, balanced, or scale-forming conditions.
- Save readings with the site name, date, notes, and calculated result.
- Keep pool chemistry records organized by property.
- Use Fahrenheit or Celsius for water temperature.
- Start a fresh reading quickly when the next stop begins.
- Recalculate after retesting or adjusting water.
- Keep recent inputs ready for faster entry.

Keep better records without slowing down:

- Browse saved pool and spa readings in one clean records list.
- Search by site, date, notes, or reading details.
- Sort records so recent visits or older history are easy to review.
- Duplicate a past record to speed up repeat service.
- Share a saved reading when a customer, supervisor, or teammate needs it.
- Add notes for treatment steps, follow-up work, or service context.
- Delete records with confirmation when cleanup is needed.
- Keep reading history in one place instead of scattered screenshots and notes.
- Review a customer's last visit before making the next adjustment.
- Carry the same workflow across iPhone and iPad.

Review trends and site history:

- Check site-based stats for saved readings.
- Compare minimum, maximum, and average chemistry values.
- Spot changes in pH, calcium hardness, alkalinity, TDS, temperature, and LSI.
- Use spreadsheet review when you want a wider look at saved data.
- Sort spreadsheet columns to focus on the number that matters.
- Review larger record sets without digging through separate notes.

Use it for common pool and spa work:

- Weekly residential pool service.
- Commercial pool maintenance.
- Spa startup and balancing.
- Water chemistry follow-up after chemical adjustment.
- Before and after treatment checks.
- Route history for repeat customers.
- Service documentation for teams.
- Personal records for pool owners who want a cleaner log.

Export and backup tools help once your record history starts to matter:

- Export saved readings for spreadsheet review.
- Create records backups for your own files.
- Create a full backup when you want extra protection.
- Import a backup to add saved data back into the app.
- Share files through the standard iPhone and iPad share sheet.

Quick Calc is there when you only need an answer:

- Run a fast local LSI check without creating a saved record.
- Reuse recent values when testing similar water.
- Share or print a quick result when needed.
- Reset inputs and move on to the next reading.

LSI Water Service Log is made for pool pros, spa techs, maintenance teams, service managers, and detail-focused pool owners. It is not trying to be a giant business suite. It is a focused water chemistry log that helps you calculate, save, review, and share the information you already work hard to collect.

If accurate water balance matters to your day, this app gives you a dependable place to keep it. Calculate LSI, save clean service records, review site history, watch trends, and export your pool and spa readings when the job calls for it.

Monthly Pro is a 1-month auto-renewable subscription.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

If your work depends on consistent pool water chemistry records, LSI Calc DB gives you a straightforward way to calculate, log, review, and export LSI data in one place.

## Key features

- LSI Calculation
- Water Chemistry Tracking
- Email Calculations
- CSV Export
- Offline Use
- Universal App Support

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| LSI Calculators pro Monthly | $1.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| LSI Calculators pro lifetime | $14.99 | one-time |


## Recent user reviews (10 of 10)

All indexed reviews: https://appshunter.io/ios/app/lsi-water-service-logbookplan/id373769371/reviews.md

### 1/5 — One off fee payment removed

*2026-06-25*

Paid the one off fee to use the app, accessed a few week, but has now stopped working and ‘restoring’ the purchase does not work either. So can no longer use.

### 5/5 — Works great

*2026-05-28*

Very pleased with the direction it’s going especially the spreadsheet view so I can look at a lot of records and data at the same time

### 5/5 — Handy for work and testing

*2017-06-09*

Good to have available for record keeping...

New database functionality is very nice, especially with the auto save.

Exporting to spreadsheets format is very helpful.

Sync works great over iCloud

### 3/5 — Handy, but needs expansion to include sulfate

*2015-05-27*

Not bad

### 5/5 — Great app

*2013-08-12*

Very useful app.

### 5/5 — Best app for LSI

*2013-06-19*

Would like to see a history of values and graph trends with a place for comments about what actions were taken to change LSI.

### 4/5 — Good app

*2013-04-23*

Needs a conductivity input option, then 5 stars

### 5/5 — Great app

*2012-06-24*

Does what it says.  I use it daily.  Better than working it out on paper!

### 4/5 — Good!

*2012-03-17*

This is great!  Please add RSI though!

### 1/5 — Interpretation wrong

*2011-10-20*

Results are backwards and don't make sense. A index of -.5 or lesser are corrosive and will pit, but app says this is scaly. A index of .5 or greater should be scale forming, but app says this is corrosive and will pit.  Sometimes app says silly things like "scale forming, but not corrosive," can something be scale forming and corrosive? Are these two things not opposites?  The rest off the app looks good, can you fix this? I will rate this app again when fixed.

## Frequently asked questions about LSI Water Service Logbook/Plan

### What is the Langelier Saturation Index calculator?

The Langelier Saturation Index calculator is a tool that helps pool owners and professionals determine the balance of their pool water. It calculates the LSI based on pH, temperature, total alkalinity, and calcium hardness levels, ensuring a healthy swimming environment.

### How accurate are the Langelier Saturation Index calculations?

The app provides instant and accurate calculations of the LSI. Users can track changes over time to make necessary adjustments to their pool's water chemistry.

### Can I use the Langelier Saturation Index calculator offline?

Yes, the Langelier Saturation Index calculator does not require network connectivity, allowing you to perform calculations anywhere.

### What devices support the Langelier Saturation Index calculator?

The Langelier Saturation Index calculator is a universal app that supports iPhone, iPod Touch, and iPad devices, ensuring compatibility across various screen sizes.

### How often is the Langelier Saturation Index calculator updated?

The latest version of iOS is supported, and the app was last updated on July 6, 2023, indicating regular maintenance and updates.

### What is the price of the Langelier Saturation Index calculator?

The Langelier Saturation Index calculator is available for a one-time purchase of $0.99.

### Can I share my pool water calculations?

Yes, you can send your calculations or conversions by email directly from the app. Additionally, you can export your data to CSV format for further analysis.

### What is the age rating for the Langelier Saturation Index calculator?

The Langelier Saturation Index calculator has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 5 releases)

### 9.3 — 2026-07-17

You keep the water work moving, and good records make that work easier to trust later. Thank you for using LSI Water Service Log and for putting it to work on real pool and spa service days.

This update focuses on a cleaner app flow, stronger Pro access handling, better settings, clearer help, and a More screen that keeps important tools easier to reach.

Navigation is now simpler:

- Quick Calc now has its own fourth tab for faster access.
- Spreadsheet review moved into More where it fits with the rest of the review tools.
- More now brings Pro, Spreadsheet, Import and Export, Settings, Help, and About together.
- The More screen has a cleaner pool-style look with simple rows and clear labels.
- Settings and About are now easy to find from More.

Pro access is clearer and easier to act on:

- The Pro screen is more compact at the top.
- Purchase options are available directly from the Pro view.
- Restore purchase access remains available.
- Locked features now guide users to the correct Pro screen.
- Pro status copy is easier to understand.
- Purchase messages use clearer App Store wording.

Purchase access is also more dependable:

- The app now checks current App Store purchase status when it launches.
- Local cached purchase state is treated only as a temporary helper.
- Cached purchase access is cleared when verification is not available.
- Unverified purchase information no longer keeps features unlocked.
- Pro access updates more directly after purchase, restore, or entitlement changes.

Settings gained useful everyday controls:

- Added an Appearance setting.
- Choose Follow System to use the device appearance.
- Choose Light when you prefer a bright app look.
- Choose Dark when you prefer a darker app look.
- Keep default units for new records and Quick Calc.
- Clear recent calculator inputs without affecting saved records.
- Check the installed app version from Settings.
- Use the new manual Check for Updates button.
- Open the App Store from the update result when a newer version is available.

About and Help are more user-friendly:

- About now includes clear AS IS and no warranty language.
- Help text now focuses on what users do in the app.
- Cleaned up wording so screens read more naturally.
- Calculator notes explain the result in plain language.
- Import and export wording now talks about backups and spreadsheet files.
- Quick Calc copy now explains local use without technical storage details.
- Support, privacy, and terms links remain grouped in Settings and About.

Import, export, and sharing text is cleaner:

- Export Spreadsheet File now uses clearer wording.
- Records Backup and Full Backup labels are easier to understand.
- Import Backup now matches the backup language used elsewhere.
- Export status messages are easier to read.
- Import success messages now refer to saved items from backup.
- Backup error messages are less technical.

Record and calculator wording also got polish:

- The help flow now starts with Add Site, Records, and More.
- Record editing instructions are clearer.
- Quick Calculator guidance now matches the current actions menu.
- Formula help keeps the useful calculation details without extra clutter.
- Local calculation text now feels more natural.

This version also tightens the finished app experience across the screens users see most. The result is a cleaner app for pool and spa water balance tracking, faster everyday navigation, more reliable Pro access, clearer settings, and better wording throughout.

Thanks again for using LSI Water Service Log. This update is meant to make every reading, record, backup, and review step feel more direct while keeping the app focused on practical pool and spa service work.

### 9.2 — 2026-05-28

This update focuses on faster workflow, clearer record handling, and stronger data portability for day-to-day pool and spa service operations.

What’s new in this version:
- Added a full tabbed app structure for Records, Add Site, Stats, Spreadsheet, Export, Quick Calc, and Help.
- Improved the record-first workflow so new measurements can be started, edited, and saved with fewer taps.
- Added better draft handling when creating a new reading from the Records tab.

Records improvements:
- Added record search across site name, date text, and notes.
- Added segmented date sorting so you can switch between newest-first and oldest-first views.
- Added swipe actions to duplicate existing records quickly.
- Added swipe actions to share a single record from the list.
- Added delete confirmation to reduce accidental data loss.
- Improved empty-state messaging for no records and no search results.

Calculator and input updates:
- Improved quick entry flow for TDS, water temp, calcium hardness, alkalinity, and pH.
- Added stronger input validation boundaries for chemistry values.
- Improved error messages for invalid or out-of-range entries.
- Added updated LSI category messaging and color-coded result states.
- Preserved recent input defaults to reduce repetitive typing.

Add Site enhancements:
- Added reusable site name and notes storage.
- Added “Choose saved site” picker flow for faster form filling.
- Added save confirmation toast so technicians get immediate feedback.
- Improved keyboard dismissal and form usability.

Stats enhancements:
- Added per-site stats navigation from the main Stats list.
- Added minimum, maximum, and average summaries for major chemistry metrics.
- Added one-tap share output for site statistics.
- Improved stats layout readability for on-site review.

Spreadsheet upgrades:
- Added spreadsheet-style grid browsing for dense record review.
- Added column header sorting interactions.
- Added initial load optimization and incremental “Load Next Rows” paging.
- Added loading state UI to clarify when rows are being prepared.
- Added device-aware batch sizing for iPhone and iPad performance.

Export and backup improvements:
- Added CSV export for GameStats records.
- Added JSON export for GameStats records.
- Added full database JSON export for broader backup needs.
- Added JSON import flow with confirmation step before applying data.
- Added import result messaging to show object count after completion.

Quick Calc tab updates:
- Added standalone local quick calculator mode with no Core Data dependency.
- Added local persistence for the most recent calculation result.
- Added reset, randomize, and share actions in the Quick Calc menu.
- Added saved timestamp visibility for the last local calculation.

Help and About updates:
- Added expanded in-app Help sections covering app flow and key screens.
- Added About screen details for version/build display.
- Added privacy and terms messaging in the About view.

Under-the-hood work:
- Improved asynchronous loading patterns in Spreadsheet view.
- Improved state handling for list/detail behavior across compact and regular layouts.
- Added utility extensions and test coverage for sorting, stats, spreadsheet behavior, and help/about content.

Quality and workflow polish:
- Improved contextual help text so new technicians can onboard faster.
- Refined wording and labels across multiple screens for clearer in-field use.
- Updated sharing and export flows to make handoff to clients and managers more consistent.

Thanks to everyone using LSI Calc DB in the field. This release is centered on reliability, faster daily logging, and easier reporting for pool water balance work.

### 9.1 — 2026-05-01

This update focuses on faster workflow, clearer record handling, and stronger data portability for day-to-day pool and spa service operations.

What’s new in this version:
- Added a full tabbed app structure for Records, Add Site, Stats, Spreadsheet, Export, Quick Calc, and Help.
- Improved the record-first workflow so new measurements can be started, edited, and saved with fewer taps.
- Added better draft handling when creating a new reading from the Records tab.

Records improvements:
- Added record search across site name, date text, and notes.
- Added segmented date sorting so you can switch between newest-first and oldest-first views.
- Added swipe actions to duplicate existing records quickly.
- Added swipe actions to share a single record from the list.
- Added delete confirmation to reduce accidental data loss.
- Improved empty-state messaging for no records and no search results.

Calculator and input updates:
- Improved quick entry flow for TDS, water temp, calcium hardness, alkalinity, and pH.
- Added stronger input validation boundaries for chemistry values.
- Improved error messages for invalid or out-of-range entries.
- Added updated LSI category messaging and color-coded result states.
- Preserved recent input defaults to reduce repetitive typing.

Add Site enhancements:
- Added reusable site name and notes storage.
- Added “Choose saved site” picker flow for faster form filling.
- Added save confirmation toast so technicians get immediate feedback.
- Improved keyboard dismissal and form usability.

Stats enhancements:
- Added per-site stats navigation from the main Stats list.
- Added minimum, maximum, and average summaries for major chemistry metrics.
- Added one-tap share output for site statistics.
- Improved stats layout readability for on-site review.

Spreadsheet upgrades:
- Added spreadsheet-style grid browsing for dense record review.
- Added column header sorting interactions.
- Added initial load optimization and incremental “Load Next Rows” paging.
- Added loading state UI to clarify when rows are being prepared.
- Added device-aware batch sizing for iPhone and iPad performance.

Export and backup improvements:
- Added CSV export for GameStats records.
- Added JSON export for GameStats records.
- Added full database JSON export for broader backup needs.
- Added JSON import flow with confirmation step before applying data.
- Added import result messaging to show object count after completion.

Quick Calc tab updates:
- Added standalone local quick calculator mode with no Core Data dependency.
- Added local persistence for the most recent calculation result.
- Added reset, randomize, and share actions in the Quick Calc menu.
- Added saved timestamp visibility for the last local calculation.

Help and About updates:
- Added expanded in-app Help sections covering app flow and key screens.
- Added About screen details for version/build display.
- Added privacy and terms messaging in the About view.

Under-the-hood work:
- Improved asynchronous loading patterns in Spreadsheet view.
- Improved state handling for list/detail behavior across compact and regular layouts.
- Added utility extensions and test coverage for sorting, stats, spreadsheet behavior, and help/about content.

Quality and workflow polish:
- Improved contextual help text so new technicians can onboard faster.
- Refined wording and labels across multiple screens for clearer in-field use.
- Updated sharing and export flows to make handoff to clients and managers more consistent.

Thanks to everyone using LSI Calc DB in the field. This release is centered on reliability, faster daily logging, and easier reporting for pool water balance work.

### 9.0 — 2026-05-01

This update focuses on faster workflow, clearer record handling, and stronger data portability for day-to-day pool and spa service operations.

What’s new in this version:
- Added a full tabbed app structure for Records, Add Site, Stats, Spreadsheet, Export, Quick Calc, and Help.
- Improved the record-first workflow so new measurements can be started, edited, and saved with fewer taps.
- Added better draft handling when creating a new reading from the Records tab.

Records improvements:
- Added record search across site name, date text, and notes.
- Added segmented date sorting so you can switch between newest-first and oldest-first views.
- Added swipe actions to duplicate existing records quickly.
- Added swipe actions to share a single record from the list.
- Added delete confirmation to reduce accidental data loss.
- Improved empty-state messaging for no records and no search results.

Calculator and input updates:
- Improved quick entry flow for TDS, water temp, calcium hardness, alkalinity, and pH.
- Added stronger input validation boundaries for chemistry values.
- Improved error messages for invalid or out-of-range entries.
- Added updated LSI category messaging and color-coded result states.
- Preserved recent input defaults to reduce repetitive typing.

Add Site enhancements:
- Added reusable site name and notes storage.
- Added “Choose saved site” picker flow for faster form filling.
- Added save confirmation toast so technicians get immediate feedback.
- Improved keyboard dismissal and form usability.

Stats enhancements:
- Added per-site stats navigation from the main Stats list.
- Added minimum, maximum, and average summaries for major chemistry metrics.
- Added one-tap share output for site statistics.
- Improved stats layout readability for on-site review.

Spreadsheet upgrades:
- Added spreadsheet-style grid browsing for dense record review.
- Added column header sorting interactions.
- Added initial load optimization and incremental “Load Next Rows” paging.
- Added loading state UI to clarify when rows are being prepared.
- Added device-aware batch sizing for iPhone and iPad performance.

Export and backup improvements:
- Added CSV export for GameStats records.
- Added JSON export for GameStats records.
- Added full database JSON export for broader backup needs.
- Added JSON import flow with confirmation step before applying data.
- Added import result messaging to show object count after completion.

Quick Calc tab updates:
- Added standalone local quick calculator mode with no Core Data dependency.
- Added local persistence for the most recent calculation result.
- Added reset, randomize, and share actions in the Quick Calc menu.
- Added saved timestamp visibility for the last local calculation.

Help and About updates:
- Added expanded in-app Help sections covering app flow and key screens.
- Added About screen details for version/build display.
- Added privacy and terms messaging in the About view.

Under-the-hood work:
- Improved asynchronous loading patterns in Spreadsheet view.
- Improved state handling for list/detail behavior across compact and regular layouts.
- Added utility extensions and test coverage for sorting, stats, spreadsheet behavior, and help/about content.

Quality and workflow polish:
- Improved contextual help text so new technicians can onboard faster.
- Refined wording and labels across multiple screens for clearer in-field use.
- Updated sharing and export flows to make handoff to clients and managers more consistent.

Thanks to everyone using LSI Calc DB in the field. This release is centered on reliability, faster daily logging, and easier reporting for pool water balance work.

### 7.2 — 2023-07-06

create merge policy for database

## More apps by Verosocial Studio

- [Heat Index & Category Computer](https://appshunter.io/ios/app/heat-index-and-category-computer/id370913314)
- [Wind Chill, Snow Day Pro](https://appshunter.io/ios/app/wind-chill-snow-day-pro/id372283970)
- [Roadtrip: Fuel & Trip Planner](https://appshunter.io/ios/app/roadtrip-fuel-and-trip-planner/id377000731)
- [Torque Calculator, Units Conv](https://appshunter.io/ios/app/torque-calculator-units-conv/id379959718)
- [Gas Oil Mixture Ratio](https://appshunter.io/ios/app/gas-oil-mixture-ratio/id380750809)

All apps by Verosocial Studio: https://appshunter.io/developer/354566841

## Related topics

[lsi calc db water balance log](https://appshunter.io/ios/topics/lsi-calc-db-water-balance-log) · [saturation index calculator](https://appshunter.io/ios/topics/saturation-index-calculator)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-21.*