Best Pool Test Kits

The four methods

Why titration matters exactly when it matters

Every strip and every color-match kit asks you to judge a shade. FAS-DPD asks you to count drops until a color disappears, which removes the judgment entirely and gives you a number rather than a range.

That is a nicety at 2 ppm and it is the whole ball game at 15 ppm. Color-match scales top out around 5 ppm and read 'high' for anything above - so when you are shocking a green pool and need to know whether you landed at 8 ppm or 25, the cheap methods cannot tell you.

FAS-DPD also measures combined chlorine separately, which is the reading that tells you whether a shock has finished its work or the pool needs another round. Nothing else on this page does that.

What each kit can and cannot see

• **Cyanuric acid.** The most commonly omitted test and the most commonly needed. It is the reading that explains a green pool with a normal chlorine number, and cheap strips frequently leave it out. Check the parameter list before buying.
• **Salt.** Only relevant on a salt-chlorinated pool, and only some kits include it.
• **Acid demand.** A titration that tells you how much acid your specific water needs to move pH, which depends on your alkalinity. Taylor's K-1004 includes it; most kits do not. It is why this site publishes no pH-down dose table.
• **Phosphate.** Not on any of the general kits here. It needs its own test - see are phosphates bad for your pool.

The picks

Top pick - Weekly testing you will actually do

AquaChek Select Connect 7-Way Test Strips, complete kit

The kit that gets used. Seven readings in fifteen seconds beats a laboratory-grade kit that stays in the shed.

The published figure

Seven parameters per strip: pH, total and free chlorine, bromine, alkalinity, hardness, cyanuric acid

The best test kit is the one you run. A strip takes fifteen seconds, which is the difference between testing weekly and testing when something looks wrong.

Seven parameters on one strip includes cyanuric acid, which most cheaper strips omit and which is the reading that explains chlorine that will not hold.

Strips are less precise than either Taylor kit and they degrade once the bottle has been opened. Note the date you opened it on the lid.

What it does well

• Fast enough that weekly testing actually happens
• Includes cyanuric acid, unlike most cheap strips
• No reagents to mix or spill

What it costs you

• Less precise than a drop kit, particularly on alkalinity
• Degrades after the bottle is opened, especially in humidity

Skip it if you are diagnosing a problem rather than monitoring. Precision matters when you are about to dose.

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Pick 2 - Knowing the number rather than the color

Taylor Technologies K-2006-SALT FAS-DPD 9-in-1 Test Kit

FAS-DPD is a drop-count titration, so the chlorine reading is a number you counted rather than a color you matched.

The published figure

FAS-DPD titration; tests free and combined chlorine, salt, pH, alkalinity, hardness, cyanuric acid

Every strip and every DPD color-match kit asks you to judge a shade. FAS-DPD asks you to count drops until a color disappears, which removes the judgment entirely.

That matters most exactly where the cheap methods fail: above about 5 ppm free chlorine, color-match scales saturate and read 'high' for anything from 6 ppm to 30 ppm. When you are shocking, that is the range you are in.

It also measures combined chlorine separately, which is the reading that tells you whether the shock worked or the pool needs another round.

What it does well

• Titration rather than color matching, so chlorine is a counted number
• Reads accurately at shock-level chlorine where strips saturate
• Measures combined chlorine, cyanuric acid and salt in one kit

What it costs you

• Slowest kit here to use — several minutes per full test
• Reagents expire and need replacing each season
• The most expensive way to test

Skip it if you will not actually run it. A kit used monthly is worse than strips used weekly.

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Pick 3 - Full chemistry without the titration

Taylor Technologies K-2005 DPD 9-in-1 Complete Pool Test Kit

The same nine tests as the K-2006 with color matching instead of titration, which is faster and less precise at the top of the chlorine range.

The published figure

DPD color comparator; free and total chlorine, bromine, pH, alkalinity, hardness, cyanuric acid

DPD is a color comparator: you match your sample against a printed block. It is quick and it is perfectly adequate at normal chlorine levels.

It saturates at high chlorine. If you shock regularly and want to know whether you are at 8 ppm or 25 ppm, this kit will not tell you.

For everything other than chlorine — pH, alkalinity, hardness, cyanuric acid — it is the same reagents and the same accuracy as the more expensive kit.

What it does well

• Full nine-parameter coverage
• Faster to run than a titration
• Same non-chlorine reagents as the K-2006

What it costs you

• Chlorine reading saturates above roughly 5 ppm
• Color matching is a judgment call in poor light

Skip it if you shock often and need to know where the chlorine actually landed. Buy the FAS-DPD.

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Pick 4 - Taking the judgment out of color matching

LaMotte ColorQ 2X Pro 7 Waterproof Bluetooth Photometer

A photometer reads the color for you, which removes the one variable a color-match kit cannot control: your eyes and your lighting.

The published figure

Digital photometer reading seven parameters from liquid and tablet reagents

Color matching goes wrong in shade, at dusk, and for anyone with a color vision deficiency. A photometer measures the sample optically and prints a number.

It still uses reagents, so the running cost and the expiry dates are unchanged from a drop kit. The instrument replaces your eye, not the chemistry.

Bluetooth logging is genuinely useful for spotting a trend rather than a snapshot, which is how most chemistry problems announce themselves.

What it does well

• Removes color-matching judgment entirely
• Logs readings so trends are visible
• Waterproof, which matters for something used at the pool edge

What it costs you

• Reagents still expire and cost money
• Most expensive option here by a wide margin
• A device with a battery is one more thing to maintain

Skip it if you can read a color comparator reliably. The instrument solves a problem you do not have.

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Pick 5 - The acid demand test

Taylor Technologies K-1004 DPD 6-in-1 Pool Test Kit

Includes an acid demand test, which is the only honest way to know how much pH reducer your pool needs.

The published figure

DPD kit including acid and base demand titrations

How much acid a pool needs to move pH from 8.0 to 7.5 depends on its total alkalinity, and no chart can tell you without knowing it. An acid demand test measures it directly.

That is why this site does not print a pH-down dose table: the number is a property of your water, not of the product, and the test costs a few dollars.

Six parameters rather than nine, so it does not cover cyanuric acid or salt.

What it does well

• Acid and base demand titrations, which most kits omit
• Cheaper than the nine-parameter kits

What it costs you

• No cyanuric acid test
• No salt test

Skip it if you need a cyanuric acid reading — that is a common problem this kit cannot see.

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Pick 6 - Refills

AquaChek 7-Way Silver Test Strips

The refill bottle. Same chemistry, no case, cheaper per strip.

The published figure

Seven-parameter strips including free and total chlorine and cyanuric acid

Once you own a kit, you are buying strips. Buying the complete kit again wastes the case and the color chart.

Store them dry and closed. Humidity is what kills strips, not age.

Same seven parameters as the complete kit above.

What it does well

• Cheaper per strip than the boxed kit
• Same seven parameters

What it costs you

• No case or chart included
• Same precision limits as any strip

Skip it if this is your first kit — buy the complete one for the chart.

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Getting an honest reading

1. **Sample elbow-deep, away from returns and skimmers.** Surface water and water near a return are not representative of the pool.
2. **Test at the same time of day.** Chlorine varies through the day with sunlight, so comparing a morning reading to an evening one is comparing two different things.
3. **Keep reagents and strips dry and out of heat.** Humidity kills strips faster than age does. Write the date you opened the bottle on the lid.
4. **Replace reagents each season.** They expire, and an expired reagent reads low without telling you.
5. **Read colors in daylight, not under a porch light.** Color matching under artificial light is where a lot of the error comes from.
6. **Rinse the vial with pool water before filling it.** Residue from the last test skews the next one.

What we could not verify

Manufacturer-stated accuracy figures for any of these kits. Taylor and LaMotte publish detailed reagent documentation but not a simple parts-per-million tolerance we could quote, and the strip makers publish nothing of the kind. This page therefore compares the methods on how they work rather than on accuracy claims we cannot source.