Test Kits

Collection: Test Kits

20 products

Test Kits

Test pool and spa water with professional accuracy using pool water test kits from Taylor Technologies, LaMotte, Pentair, AquaChek, and Natural Chemistry. PST Pool Supplies stocks drop test kits, digital meters, and specialty kits for every water chemistry parameter — chlorine, bromine, pH, total alkalinity, calcium hardness, cyanuric acid, salt, and phosphate — starting from $16.20.

Accurate, comprehensive water testing is the foundation of effective pool management — and professional drop test kits provide significantly more accurate results than test strips for most parameters. The key kits in this collection: Taylor K-2006 is the industry-standard complete professional test kit used by pool service technicians — tests free chlorine (FAS-DPD titration method, highly accurate), combined chlorine, total alkalinity, calcium hardness, cyanuric acid, and pH. The FAS-DPD method used in the K-2006 remains accurate at high chlorine levels where DPD tests bleach out and read falsely low. The Taylor K-2006C is the K-2006 in larger 2 oz reagent bottles — appropriate for commercial pools or high-frequency testing. The Taylor K-2005 covers the same parameters using the High Range DPD method (appropriate for residential pools with normal chlorine levels); the K-2005-Salt adds salt (chloride) testing to the K-2005 parameter set for salt chlorine generator pools. The Taylor K-1766 (sodium chloride salt water drop test, 200 ppm range) and K-1770 (calcium hardness drop test, 10 ppm range) are stand-alone specialty kits for single-parameter testing. LaMotte Tracer Digital Meter ($189.50) is a professional digital meter measuring salt, TDS, and temperature simultaneously — eliminating titration drop counting for these parameters. LaMotte Insta-Test strips and Alk-Test provide rapid single-parameter results for alkalinity (#3) and multi-parameter testing (#5). The Pentair 756 Test Kit tests bromine and pH — appropriate for spa users on bromine programs. The Natural Chemistry/Biolab Phosphate Test Kit (6-pack) is essential for diagnosing algae resistance in pools treated with phosphate removers.

For residential pool owners: the Taylor K-2006 is the single best investment in pool testing equipment — its FAS-DPD chlorine method is accurate across the full chlorine range, and the complete parameter set enables full Langelier Saturation Index water balance calculations. Replace reagents annually for reliable results.

Shop professional pool test kits at PST Pool Supplies and make every chemical adjustment with confidence backed by accurate water analysis.

Frequently Asked Questions

What is the difference between FAS-DPD and DPD pool test kits?
Both FAS-DPD and DPD are methods for measuring free chlorine in pool water, but they differ in accuracy at high chlorine levels: DPD (diethyl-p-phenylenediamine) — the DPD reagent turns the water sample pink; the intensity of the pink color is compared to a color chart to estimate chlorine concentration. At chlorine levels above 3–5 ppm, the DPD reagent "bleaches out" — the color fades paradoxically at very high chlorine, causing the test to read falsely low (or even zero). This makes DPD tests unreliable immediately after shocking a pool. FAS-DPD (ferrous ammonium sulfate drop test) — used in the Taylor K-2006. The DPD indicator turns the sample pink, then a FAS titrant is added drop by drop until the color disappears. Each drop of FAS titrant corresponds to a specific ppm of chlorine — you count the drops to calculate the exact concentration. FAS-DPD is accurate across the entire chlorine range (0–50+ ppm) and is the method of choice for shock testing, commercial pools, and any situation where precision matters. For residential pools operating at 1–3 ppm chlorine, DPD (K-2005) is adequate. For shock verification, salt pools running higher residuals, or commercial applications, always use FAS-DPD (K-2006).
What does the Taylor K-2006 test kit include and how is it used?
The Taylor K-2006 is a complete professional water test kit covering six parameters: (1) Free chlorine (FAS-DPD titration — count drops of R-0871 until pink clears; each drop = 0.2 ppm at 10mL sample), (2) Combined chlorine (add R-0003 to re-pink the sample and titrate again — difference is combined/total minus free), (3) pH (R-0004 indicator compared to color wheel), (4) Total alkalinity (R-0007 indicator + R-0008 acid titration, count drops), (5) Calcium hardness (R-0010 + R-0011L indicator, titrate with R-0012), (6) Cyanuric acid/stabilizer (turbidity test — add sample to R-0013 and read turbidity). The kit includes all reagents in 3/4 oz (22mL) bottles for the standard K-2006 and 2 oz bottles for the K-2006C. For accurate results: use fresh DI or distilled water to rinse test tubes (not tap water — tap water's own chemistry contaminates samples), use the specified sample volumes exactly (typically 10mL or 25mL), and test at water temperature between 65–85°F. Reagent bottles are color-coded; the instruction booklet details the step-by-step procedure for each parameter with color-matching guidance.
Do I need a salt test kit if I have a salt chlorine generator?
Yes — a dedicated salt test is essential for managing a salt chlorine generator properly. The generator's display shows a salt reading, but these built-in sensors drift over time and are often inaccurate. An accurate salt level ensures: (1) Correct chlorine production — most generators require 2,700–3,400 ppm salt to produce chlorine efficiently; below this range, output drops or the generator displays low salt errors. (2) Equipment protection — salt above 4,000 ppm accelerates corrosion of metal fittings, heater elements, and pool surfaces. The Taylor K-2005-Salt adds chloride (salt) drop titration to the full K-2005 parameter set — one kit covers all your water chemistry needs including salt. The Taylor K-1766 is a standalone salt test for those who already have a comprehensive test kit but need to add salt testing. The LaMotte Tracer Digital Meter provides digital salt, TDS, and temperature in one unit — the fastest method for routine salt monitoring without drop counting. Calibrate digital salt meters monthly with the Hayward calibration solution for reliable readings.
How do I test pool water phosphate levels and why does it matter?
Phosphate testing uses the Natural Chemistry/Biolab Phosphate Test Kit — add a reagent to a water sample and compare the resulting blue color to a chart (deeper blue = higher phosphate). The test is typically done when: (1) Algae is persistent despite correct chemistry — phosphates are the primary nutrient for algae. Pools with high phosphate (over 100–200 ppb) support rapid algae growth even with adequate sanitizer levels. Testing confirms whether phosphate is the underlying cause. (2) After heavy rain or fertilizer runoff events — rainwater washes lawn fertilizer (high in phosphate) into pool water, dramatically raising phosphate levels overnight. (3) Before starting a phosphate remover treatment — establish a baseline to verify the treatment is working. Most phosphate removers target levels below 100–125 ppb. For ongoing monitoring, test monthly during peak season (heavy rain, high bather load, nearby fertilized landscaping). Note: the BluWater sodium bromide test strips in our test strip collection also check phosphate levels (target below 125 ppb), making them useful for quick phosphate screening without a dedicated kit.