Hot Tub Test Machine – hot tub water testing made simple

How it works

Pick your tub

Choose Small, Medium, Large or Extra large, or type your litres.

Dip and tap

Dip a test strip, then tap the matching colours for chlorine or bromine, pH, alkalinity and hardness.

Get your dose

Exact grams in the right order: alkalinity, then pH, then chlorine, with 2 hours between each.

Track your tub

Every result is saved to your tub history, so you can see what you added and when.

Features

Any tub, any brandInflatable or hard tub, sized by litres.
UK metricGrams, litres and ppm. No US ounces or gallons.
Chlorine or bromineWorks with whichever sanitiser you use.
Right order, every timeStep-by-step with 2-hour retest waits.
Test remindersEvery 2 or 3 days, plus a weekly shock reminder.
One-off £1.99No subscription, no account needed.

FAQs

Does it work with my brand of hot tub?

Yes. The app is brand-neutral and works for any inflatable or hard tub. Just pick the closest size or type your tub’s litres.

Which test strips do I need?

Any standard hot tub strip that measures chlorine or bromine, pH, total alkalinity and (optionally) hardness. Colours vary by brand, so compare against the chart on your strip tube.

Is everything in metric?

Yes. Doses are in grams, volumes in litres and readings in ppm, using products sold in the UK. Example doses are based on products such as Clearwater and AquaSPArkle.

Can I rely on the doses?

They are guidance only. Always follow the instructions on the product label, and retest before adding more.

Why are there Amazon buttons?

Some steps have a “Buy on Amazon” button marked “Ad”. As an Amazon Associate I earn from qualifying purchases, at no extra cost to you. You can use any shop you like.