Water-ID - DPD No. 1 Free Chlorine Reagent Tablets – Pack of 500 - TbsPD1500

Water-ID – DPD No. 1 Free Chlorine Reagent Tablets – Pack of 500

These genuine Water-ID DPD No. 1 reagent tablets are the consumable refill for measuring free chlorine — the active disinfectant in your pool or spa — using the Water-ID PoolLab 1.0 photometer. Each tablet delivers a precise, pre-measured dose of N,N-diethyl-p-phenylenediamine (DPD) that reacts with chlorine in the water sample to produce a pink coloration, which the photometer reads across a range of 0.0–6.0 mg/l (ppm). With 500 tablets per pack, this is the ideal economy refill for busy pool operators and service technicians.

Why Free Chlorine Testing Matters

Free chlorine is the fraction of chlorine immediately available for disinfection — killing bacteria, viruses, and algae before they can cause harm. Too little and the water becomes unsafe; too much can irritate swimmers’ eyes and skin. Regular photometric testing with DPD No. 1 gives you a reliable, objective reading that colour-comparison strips simply cannot match, allowing prompt, accurate dosing adjustments every time.

How to Use

Fill the PoolLab 1.0 cuvette with a small amount of pool water, add one DPD No. 1 tablet, and crush it gently. Top up to the fill line, swirl to mix, and insert the cuvette into the photometer — the result is displayed within seconds. Each tablet is individually blister-packed in Germany to ensure exact dosing and a long shelf life; store in a cool, dry place away from direct sunlight to preserve reagent accuracy.

Compatibility

These tablets are made specifically for use with the Water-ID PoolLab 1.0 photometer and are produced, blistered, and packaged in Germany to the quality standards required by that instrument. Always use genuine Water-ID reagents to ensure validated, photometer-grade results — third-party tablets may affect measurement accuracy and are not covered by Water-ID’s quality guarantee.