Pentair Air Flow Switch | MasterTemp & Max-E-Therm Pool Heaters | 42001-0061S C9494 inspect the strainer cover and

inspect the strainer cover and lock ring threads for hairline cracks each time you service the basket — early replacement prevents air ingestion and loss of prime

EDTA titration (includes inhibitors to prevent metal interference) 1 drop = 10 ppm calcium hardness as CaCO₃ Chlorine

The Pentair Strainer Basket (400007Z) is the OEM replacement strainer basket for the WhisperFlo XF

This is the product of choice in areas with hard water problems

Total Alkalinity

Pentair Air Flow Switch | MasterTemp & Max-E-Therm Pool Heaters | 42001-0061S C9494 inspect the strainer cover andThe Pentair Air Flow Switch (42001 0061S) is the OEM replacement air flow switch for Pentair MasterTemp and Pentair (formerly Sta Rite) Max E Therm pool heaters. IMPORTANT: HEATER COMPONENT LICENSED TECHNICIAN REQUIRED Gas and electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service gas or high voltage components without proper certification. The air flow switch monitors