Three Ways to Test Your Water
Every number you plug into a dosing calculator starts with a water test, and there are three common ways to get it. Test strips — dip, wait, match the colors to a chart. Liquid drop kits — add reagents to a water sample and read the color or count drops (titration). Digital testers — a meter or photometer reads the sample electronically. Strips and drop kits are what most owners choose between, so that's the real question.
Head-to-Head
| Test Strips | Liquid Drop Kit | |
|---|---|---|
| Speed | Fastest (~15 sec) | A few minutes |
| Accuracy | Ballpark | High |
| Ease | Very easy | Small learning curve |
| Best for | Quick weekly checks | Problem-solving, precise dosing |
| Weak point | CYA & high ranges | Slower, more steps |
| Upfront cost | Low | Higher, lasts longer |
The short version: strips trade accuracy for speed; drop kits trade speed for accuracy. Most engaged owners end up owning both.
When Test Strips Are Fine
For routine weekly checks on a balanced, healthy pool, strips are genuinely good enough. They tell you at a glance whether chlorine and pH are roughly where they should be, which is all you need when nothing's wrong. They're cheap, take seconds, and need no technique.
Two things kill strip accuracy: moisture and age. Wet fingers in the bottle, a lid left open, or a strip past its date all throw the colors off. Keep the bottle sealed and dry, replace it each season, and read the pad at the time the instructions say — colors keep shifting if you wait.
When You Need a Drop Kit
When something's actually wrong — cloudy water, an algae bloom, chlorine that won't hold, a big correction to make — strip guesses aren't precise enough to dose from. A liquid kit gives you real numbers. The gold-standard home kit (such as a Taylor K-2006) uses an FAS-DPD chlorine test that counts drops to a color change, so it reads accurately even at the high chlorine levels a SLAM needs — exactly where strips max out and go useless.
Drop kits are also far better at CYA, which strips notoriously misjudge, and they don't degrade the way strip pads do — the limiting factor is reagent shelf life, so check the reagent expiry date on every bottle and replace anything past it — expired DPD or titrant drifts low and quietly hands you a wrong number that looks perfectly normal. If you take pool chemistry seriously, a titration kit pays for itself in chemicals you don't waste correcting bad readings.
The practical setup
Strips for the quick weekly glance, a drop kit for problem-solving and any time you're about to add a meaningful dose. Best of both — speed when it's fine, precision when it matters.
Turn Your Readings Into Doses
However you test, the calculators turn your numbers into exact chemical amounts — chlorine, pH, alkalinity, CYA, salt, and more.
Getting an Accurate Reading — Either Way
- Sample elbow-deep, away from returns and skimmers, where the water is mixed.
- Test at a consistent time — chlorine reads higher right after dosing and lower late in the day.
- Check expiry on strips and reagents. Expired chemistry is the top cause of "wrong" readings.
- Read strip pads under natural light at the stated time; hold the sample against white for drop tests.
- When a reading looks shocking, re-test before dumping in chemicals.
New to the numbers themselves? Our Pool Chemistry 101 guide explains what each reading means and the ranges to aim for.