Where we mention AquaChek Yellow 4-Way Pool and Spa Test Strips - 50 Yellow Test Strips - pH, Free Chlorine, Total Alkalinity, and Cyanuric Acid

• Pool Test Strip Accuracy: How Reliable Are Strips Really?

  Basic pick · Best for: Basic 4-way for homeowners who only need FC, pH, TA, and CYA

• How to Get Rid of Mustard Algae in a Pool (Brush + Shock Protocol)

  Reads CYA — required by the FC floor · Best for: The one dip that produces the cyanuric acid reading the CYA-aware free chlorine target is computed from.