DPD Reagent #1 (0.75 oz)

The DPD Reagent #1 (0.75 oz) is a precision testing solution designed to accurately measure free chlorine and bromine levels in swimming pools and spas. As the first step in the DPD chlorine test method, this reagent reacts instantly with the chlorine present in your water sample to produce a distinct pink or red color. The intensity of the color indicates the concentration of free chlorine—giving you a quick, reliable way to verify sanitizer strength and maintain crystal-clear, safe water.

Packaged in a convenient 0.75 oz dropper bottle, this reagent is compatible with most professional and residential DPD test kits. It’s an essential component for anyone performing routine water balance maintenance, ensuring optimal disinfection and bather comfort.

Specifications & Features

Size: 0.75 oz dropper bottle

Function: Used to test free chlorine (and bromine) levels

Test Method: Step 1 of the standard DPD chlorine test sequence (used with DPD #2 and #3 for total chlorine)

Application: For pools, spas, and commercial water systems

Form: Liquid reagent, easy-dispense dropper cap

Reaction: Produces a pink/red color when chlorine or bromine is present

Compatibility: Works with most DPD-based pool and spa test kits (including tablet and liquid systems)

Accuracy: Provides consistent color development for precise readings

Shelf Life: Approximately 1 year when properly stored

Storage: Keep tightly sealed, away from heat and direct sunlight

Safety: Avoid skin or eye contact; not for ingestion

Maintenance Tip: Replace reagents annually for accurate water testing results