Got questions about pool water chemistry? This FAQ answers what pool owners and service technicians ask most — clearly and without jargon — and points you to a free app that handles the hard parts.
Quick How-To
- Start simple. Enter your basics once so everything is tailored to you.
- Log consistently. A few taps each time is all it takes.
- Act on the numbers. Let the app tell you the next step.
- Review and adjust. Use the trends to improve over time.
Frequently Asked Questions
What is the ideal pH for a pool?
7.4–7.6. Below 7.2 is corrosive; above 7.8 causes scale and cloudy water.
How do I lower high chlorine fast?
Stop adding chlorine, run the pump and let sunlight burn it off; a small neutraliser dose works if you need the pool sooner.
What does LSI tell me?
Whether your water is scale-forming (positive) or corrosive (negative). Aim near zero.
How much acid to lower pH?
It depends on volume and current alkalinity — the dosing calculator gives the exact amount.
Why is my water cloudy despite chlorine?
Often high pH, high CYA locking up chlorine, or poor filtration. Check every parameter together.
Is the app free?
Yes — all calculators and logging are free, with an optional ad-free Pro upgrade.
What the Free App Does For You
Pool Chemistry Pro brings it all together:
- LSI (Langelier Saturation Index) calculator for scale/corrosion balance
- Chemical dosing calculators (chlorine, acid, alkalinity, calcium, CYA, salt)
- Free chlorine, pH, alkalinity, calcium hardness and CYA logging
- Multi-pool profiles for service routes
- Target ranges with red/amber/green status
- Pool volume calculator for any shape
…and more — all offline, private, and free with an optional ad-free Pro upgrade.