This is a Pentair Rainbow #77DPD 4-in-1 Chlorine/Bromine Test Kit for Chlorine/Bromine, pH, Acid Demand and Total Alkalinity using drop test and color comparator method. The kit includes a lucite test cell with wide standards. It also includes instructions and is housed in a blue display box. This 4-in-1 kit is a good kit residential pools.
Testing your swimming pool pH is one of the most important water chemical tests for water balance. When testing pH, what you are really measuring is how acidic or how alkaline the pool water is. If the water pH is too far one way or the other, you risk ending up with unbalanced swimming pool water.
