Speck OTO and Phenol Red Reagent Refill Kit

The Speck OTO and Phenol Red reagent refill kit is a professional-tier liquid indicator replacement pack formulated to monitor and maintain accurate chemical water balance parameters. Manufactured under strict quality controls for Speck Pumps South Africa, these liquid test drops provide residential pool owners, commercial spa operators, and water treatment specialists with rapid, on-site diagnostics. The Orthotolidine (OTO) solution is engineered to quickly isolate total sanitiser concentrations, transitioning into distinct yellow gradients to indicate active chlorine levels. Conversely, the Phenol Red indicator monitors the overall potential of hydrogen (pH) boundaries, tracking shifts in water acidity or alkalinity to safeguard swimmers against skin irritation and defend expensive underwater plumbing assets against scale or corrosive etching.