Testing your pool water: strips, drops or photo?
- Testing is half the maintenance: you can only correct properly what you measure.
- Test strips: quick and comprehensive, but reading the colours by eye is THE classic source of error.
- AI photo reading (CliniPool app) reads the strip for you: same 30 seconds, without the interpretation error.
- Frequency: once a week in season, more often during heatwaves, after storms, heavy use or a treatment.
All pool maintenance rests on one activity that takes 30 seconds: testing the water. You can only correct properly what you measure — every problem on this site starts with “test your water” for a good reason. Three methods exist: test strips (quick, comprehensive, but read by eye), drop kits (precise, slower), and AI photo reading — you dip a strip, take a photo, and the CliniPool app reads the colours for you. Same half-minute, minus the weak link: human colour interpretation.
The weak link of test strips: your eyes (and ours)
The strip itself is a good tool: several parameters at once, low cost, results in seconds. The trouble starts after dipping: you have to compare small coloured pads against a printed scale, under whatever light you happen to have, within a short window (the colours keep evolving). Telling the “1 ppm” pink from the “3 ppm” pink against the light on a summer evening? Two perfectly honest people will read two different results — and we’ve seen readings vary threefold on the very same water. And a reading that drifts means a dose that drifts with it.
That’s exactly the problem photo reading solves: the algorithm applies the same criteria every time, handles the lighting, and fills in your results without a moment’s doubt. The strip provides the chemistry; the photo provides the objectivity.
Strips, drops, photo: who does what
Strips + AI photo: the standard for everyday monitoring — wide parameter coverage, 30 seconds, objective reading. It’s the method at the heart of the app.
Drop kits (liquid reagents): the precision benchmark for a given parameter, at the cost of fiddling (vials, counting drops). Useful as an occasional complement — for instance to confirm a critical stabiliser level before deciding on a partial drain.
Tablets and photometers: precise, pricier, more the professional’s world.
The key isn’t the perfect tool, it’s consistency with a constant method: steady monitoring with photo-read strips beats ten “premium” tests done at random.
When to test
Cruising rhythm: once a week in season. Plus an event-driven test whenever the water goes through something: after a storm (debris + dilution), during a heatwave (everything speeds up), after heavy bathing, during and after a treatment, and at season opening/closing. Off-season with active winterising, once a month is enough.
The right reading order, always the same: pH first (it governs the effectiveness of everything else), then sanitiser, then the background parameters (alkalinity, stabiliser, hardness) that move slowly.
From numbers to action
The test is only half the journey: you still have to turn five numbers into a decision. Which parameter to correct first? By how much, for YOUR volume and YOUR products? That’s the app’s job: you photograph, it reads, prioritises (pH before chlorine, always), calculates the doses with safeguards, and follows you through to the re-test. The history shows you the underlying trends — the stabiliser creeping up, the pH drifting — the ones you never spot on a single test.
Frequently asked questions
How often should you test pool water?
Once a week in season as a baseline, plus an extra test after every event: storm, heatwave, heavy bathing, treatment in progress. Off-season (active winterising): once a month is usually enough.
Are test strips reliable?
Chemically, yes — as long as they're stored dry and not expired. The weak link is the READING: judging shades of pink by eye, under varying light, easily skews the interpretation. That's the error photo reading eliminates.
Why do two people read different results on the same strip?
Colour perception, lighting, reading delay (the colours keep changing after dipping): reading by eye is subjective. An algorithmic photo reading applies the same criteria every time.
What should I measure first?
The core trio: pH, sanitiser (free/total chlorine or bromine), then regularly alkalinity, stabiliser and hardness. pH first: it's what governs everything else.