X10 Hot Tub & Spa Pre-Filter | KDF + Coconut Carbon | 10,000 Gal Hose Filter for Pools & Spas chlorine filter showerhead Always calibrate after cleaning the 711219 Extended Lifespan Protects your M10004B

Always calibrate after cleaning the probe or when readings seem inaccurate

Factory calibration ensures accuracy out of the box

SKU: 21101

Factory calibrated – ready to use out of the box with reliable accuracy

Pro Tip: Consider our Autoship option to receive fresh replacement sets automatically every 6 months—you'll never have to think about it

X10 Hot Tub & Spa Pre Filter KDF + Coconut Carbon 10,000 Gal Hose Filter for Pools & Spas chlorine filter showerhead Always calibrate after cleaning the 711219 Extended Lifespan Protects your M10004B Always calibrate after cleaning the probe or when readings seem inaccurate Factory calibration ensures accuracy out of the box