POOL/SPA Poolmaster #2 - Phenol Red Solution PreviousPoolmaster Orthotolidine (OTO) Indicator Solution - 1/2 oz NextPoolmaster Solution #2 Phenol Red - 1/2 fl oz. Poolmaster #2 - Phenol Red Solution Poolmaster #2 - Phenol Red Solution $3.99 For maintaining proper water chemistry! Quantity: Add To Cart Facebook0 Twitter