# Reverse Flow: Fire Hydraulics

> Firefighter hydraulics calculator for flow rates, pump pressures, and relay pumping. (iPhone/iPad app by DEREK ANDREW MURDOCK.)

- Source: https://appshunter.io/ios/app/reverse-flow-fire-hydraulics/id6775030535 (this page in markdown: same URL + `.md`)
- Developer: [DEREK ANDREW MURDOCK](https://appshunter.io/developer/6775030537)
- Category: Utilities, Reference
- Price: Free with in-app purchases
- Rating: 5.00/5 from 5 App Store ratings
- Age rating: 4+
- Requires: iOS 15.0 · 7 MB
- Languages: American English
- Released: 2026-06-04
- Data updated: 2026-09-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/reverse-flow-fire-hydraulics/id6775030535/reviews.md

## What is Reverse Flow?

The ultimate Fireground Hydraulics app!

Constantly evolving and improving features. 

Currently includes: 
- Generous Suite of calculators
- Friction Loss and Pump chart generators
- Reference Materials
- IOS Widgets

Completely Free | No Purchase Required | Supported by the Reverse Flow Community

Privacy Policy: https://reverse-flow.app/privacy.html

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- Reverse Flow calculations
- Required PDP calculations
- Relay Pumping calculations
- Split Lay analysis
- Pump Chart storage
- Nozzle support
- Custom hose coefficients

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Reverse Flow Monthly Support $10 | $9.99 | per month |
| Reverse Flow Monthly Support $3 | $2.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Reverse Flow One-Time Support $5 | $4.99 | one-time |
| Reverse Flow Pro | $4.99 | one-time |



## Frequently asked questions about Reverse Flow

### What is Reverse Flow used for?

Reverse Flow is a professional fireground hydraulics platform designed for firefighters, pump operators, engineers, and instructors. It helps calculate flow rates, required pump discharge pressures, and relay pumping requirements for training and operational planning.

### What types of calculations does Reverse Flow support?

Reverse Flow supports Reverse Flow calculations, Required PDP calculations, Relay Pumping calculations, and complex split-lay hose evolutions. It also allows for appliance and elevation loss adjustments.

### Does Reverse Flow support different nozzle types?

Yes, Reverse Flow supports both smoothbore and fog nozzle types. It also allows for custom hose coefficients to ensure accurate calculations for various equipment.

### Is Reverse Flow available on Android devices?

Based on the provided data, Reverse Flow is available on iPhone, iPad, and iPod. Information regarding Android compatibility is not available.

### How often is Reverse Flow updated?

The latest version of Reverse Flow is 1.0.3, which was last updated on June 11, 2026. This indicates recent development and maintenance.

### What is the age rating for Reverse Flow?

Reverse Flow has an age rating of 4+, making it suitable for a wide range of users. This rating suggests it contains no mature content.

### Does Reverse Flow have ads?

No, Reverse Flow does not contain advertisements. The app is free to download and use without any ad interruptions.

### What is the user sentiment for Reverse Flow?

Reverse Flow has received excellent user feedback, with an average rating of 5.0 stars from 3 ratings. This indicates a high level of user satisfaction.

## Version history (last 5 releases)

### 2.2 — 2026-08-07

Pump Panel! Add lines saved in your pump chart to pump panel to track Master PDP, what each line should be gated back to, and total flow!

### 2.1 — 2026-08-02

New widgets!

### Version 2.0 — 2026-07-28

Everything is now free!

### 1.3.2 — 2026-07-15

Bug Fixes

### 1.2.3 — 2026-07-06

- New smoothbore tips
- New HEN manufacturer information 
- New Training Directory view

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## Related topics

[fire flow](https://appshunter.io/ios/topics/fire-flow)

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*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 2026-09-01.*