back2book vs Pool Chemistry

This app lets you paper backup the phone numbers stored in your iPhone or iPad. If you ever lost your mobile or ran out of battery in front of a friends new house whose name is not written on the bell yet, you might have started writing little notes with important numbers and keep them in your wallet. Back2book lets you create a complete backup of your contacts – a wallet sized paper phone book. It takes less then five minutes and is really simple. All you need is a normal printer, scissors and a stapler.

Chlor is the precision pool chemistry companion built for serious pool owners. Stop guessing - test smarter, dose accurately, and swim in perfectly balanced water every time. WHETHER YOU OWN A POOL, SPA, OR HOT TUB Chlor tracks every body of water you manage. Log test results, calculate exact chemical doses, and follow a smart maintenance schedule - all in one beautifully designed app. ACCURATE CHEMICAL CALCULATORS - Free Chlorine - calculate exact liquid chlorine, Cal-Hypo, Dichlor, or Trichlor dose - pH - calculate muriatic acid or soda ash to hit your target - Total Alkalinity - sodium bicarbonate dosing with precise measurements - CYA (Cyanuric Acid) - stabilizer additions with partial drain guidance - Calcium Hardness - raise calcium with calcium chloride calculations - Langelier Saturation Index (LSI) - prevent corrosion and scaling - SLAM Calculator - shock treatment with CYA-adjusted FC targets - Salt Level - sodium chloride additions for saltwater pools - Volume Estimator - calculate gallons from pool dimensions SMART TEST LOGGING - Log your water test results with a clean, fast interface - Color-coded status indicators show exactly which parameters are in or out of range - Full test history with timestamps and test kit identification - Filter tests by pool or hot tub CHEMISTRY TRENDS (Pro) Track how your pH, free chlorine, and total alkalinity change over time. Visualize trends with interactive charts, spot seasonal patterns, and catch drift before it becomes a problem. CHEMICAL TREATMENT LOG Record every product you add to your pool - liquid chlorine, muriatic acid, sodium bicarb, algaecide, and more. Each treatment is linked to your water body and timestamped so you always know what went in and when. CYA-ADJUSTED FREE CHLORINE TARGETS Chlor uses the scientifically correct FC:CYA ratio to calculate your ideal free chlorine range - not the oversimplified 1-3 ppm most apps use. Your pool is as unique as your CYA level. MAINTENANCE SCHEDULE - Create recurring tasks (skimming, filter cleaning, equipment checks) with custom frequencies - Tasks are automatically sorted by urgency: overdue, due this week, and upcoming - Mark tasks complete and view your full maintenance history AI POOL ASSISTANT (Pro) Ask any pool chemistry question and get personalized advice based on your water body and recent test results. Troubleshooting cloudy water, planning a SLAM, or figuring out the right stabilizer dose - the AI assistant gives you an instant expert answer. MULTIPLE POOLS AND SPAS Manage your backyard pool, the hot tub, and the spa all in one app. Each body of water gets its own test history, calculator context, and maintenance schedule. DESIGNED FOR ACCURACY Chlor's calculation engine is based on the industry-standard chemistry formulas used by professional pool technicians. Every dose calculation accounts for your pool volume, current levels, target levels, and chemical concentration. CHLOR PRO Upgrade to unlock all 9 calculators, unlimited test history, chemistry trends charts, full maintenance history, AI Pool Assistant, and unlimited pools and spas. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/