Pool & Hot Tub Chemistry Log

Enter your water test and get exact chemical doses for your pool or hot tub, step by step. Every test is kept in your history.

HOW IT WORKS
1. Test your water with drops, strips or a photometer.
2. Enter the numbers you have. Any subset works; blank fields are skipped.
3. Get a dose plan: which product, how much in your units, in a safe order, with the level you can expect after each step.
4. Mark each dose as added. The app keeps the log for you.

POOL CHEMICAL CALCULATOR
• Free chlorine, combined chlorine, pH, total alkalinity, calcium hardness, CYA (stabilizer), salt and bromine
• Chlorine targets follow your CYA level, so you never chase the wrong number
• Liquid chlorine, cal-hypo, trichlor and dichlor, with their effect on CYA, calcium and alkalinity
• Muriatic acid, dry acid, soda ash, baking soda, calcium chloride, stabilizer and salt
• pH doses are capped per step and calculated conservatively, then you retest, so pH does not overshoot
• "Why this amount?" shows the formula behind every dose
• Shock plan when combined chlorine is high
• Drain-and-refill calculator for high calcium, CYA or salt, and a guide for lowering alkalinity

POOLS AND HOT TUBS
• Chlorine, salt water generator or trichlor pools
• Chlorine or bromine hot tubs and spas, with hot tub ranges
• Small hot tub doses shown in teaspoons or grams
• Plaster, vinyl and fibreglass surfaces
• US and Australian (AS3633) target ranges, or set your own

ANY UNITS
US gallons, liters or imperial gallons; ounces and pounds or grams and kilograms; fluid ounces or milliliters; °F or °C. Every dose is rounded to an amount you can actually measure.

WATER TEST LOG
• Unlimited test history and dose log in the free version
• Green, amber and red status for every value
• Test reminders every few days
• Backup and restore with a file

YOUR DATA STAYS ON YOUR PHONE
No account and no sign-in. No ads. No subscription. The app works offline and does not collect your data.

PRO (ONE-TIME PURCHASE)
• Unlimited pools and hot tubs
• Trend charts for every parameter
• LSI (Langelier) water balance calculator
• Chemical cost tracking per dose and per season
• CSV and PDF test reports to share with a pool service
• Custom products with your own name and strength

SAFETY
The app gives water-chemistry estimates, not health or safety guarantees. Always check your product label, never mix chemicals, and add each one separately to the water.

Recent changes:
Updated internal components and optimized app code for better performance and compatibility.