Stop guessing how much chemical to add.

Most pool and hot tub owners work from the back of a bottle, a rough guess, or advice for a different-sized pool. Add too little and nothing changes. Add too much and you're draining water, waiting days, or buying more chemicals to fix the last lot.

AquaCheck does the maths for your water, not a generic pool.

HOW IT WORKS

1. Enter your pool or hot tub dimensions once. AquaCheck works out the volume.
2. Enter your test strip or test kit readings.
3. Get a colour-coded water report showing what is out of range.
4. Follow the treatment wizard: what to add, in the right order, with timers between steps.

WHAT AQUACHECK BALANCES

- pH — too high and your chlorine stops working properly
- Free chlorine, or bromine if that is what you use
- Total alkalinity — the buffer that holds your pH steady
- Calcium hardness — protects surfaces, liners and equipment
- Stabiliser (cyanuric acid) — stops sunlight destroying your chlorine

THE ORDER MATTERS

Adding the right chemicals in the wrong sequence wastes both. Fixing pH before alkalinity means redoing the pH. Adding chlorine at the wrong pH burns most of it off for nothing. AquaCheck sequences every treatment and holds you at each step, with a timer, until the water is ready for the next chemical. Timers keep running when your phone is locked or the app is in the background.

WORKS WITH YOUR SETUP

Water types: inground, above ground, indoor and outdoor pools, hot tubs, swim spas, and cold plunge pools.

Shapes: rectangle, square, oval, round, kidney, freeform, and varied-depth pools.

Sanitisers: chlorine, bromine, and saltwater pools running a salt chlorinator.

Also: granules or tablets with your own tablet size, metric or imperial units, and unlimited water profiles so a house pool, a hot tub and a holiday let are tracked separately.

WORKS AT THE POOLSIDE

No signal needed. AquaCheck runs fully offline — in the garden, the pool house, or anywhere reception doesn't reach.

PRIVATE BY DESIGN

No account. No sign-up. No email address. Your profiles, readings and history stay on your phone and are never uploaded. Delete the app and they're gone with it.

FREE FEATURES

- Unlimited water profiles
- Volume calculator for every shape
- Colour-coded water report
- Treatment wizard with the correct dosing order
- Timers between every step
- Your last 3 tests

AQUACHECK PRO

- Exact gram and ounce doses for your precise water volume
- Full test history, as far back as you've been testing
- Trend charts for every parameter
- Insights panel spotting patterns before they become problems

Try Pro free for 7 days on the annual plan. Pro is £2.99 per month or £19.99 per year, cancel any time.

IMPORTANT

AquaCheck gives estimates based on standard pool chemistry formulas, for guidance only, not professional advice. Always follow the instructions on your chemical labels — concentrations vary between brands. Never mix pool chemicals together directly. If unsure, consult a qualified pool professional.