Residual Chlorine Test Reagent - 50 packets This is often used as a guide for replacing water purifier cartridges. Simply collect water and add this reagent. Testing is very easy. In the coming season, many people will likely use it to check the chlorine levels in their home pools. Collect water (10mL) in a cup, etc., and add the reagent. It will react with chlorine and change to pink. The concentration of the pink color indicates the chlorine level. It's a powder type that dissolves easily and doesn't spill, making it user-friendly. For regular testing at hot spring facilities, pools, etc. It's also good for households with water purifiers to check if the chlorine is being properly removed. #Ohyalux #WaterQualityTest #Aquarium