The ResinTech AF-20-3690-BB cartridges utilize the advanced media technology of ResinTech® SIR-900 media, a synthetic aluminum oxide that remove fluoride by a chemical reaction with the media. ResinTech® SIR-900 has minimal shrinkage /swelling and low-pressure loss, and can be used over a wide pH range. Sized to fit standard Slimline and Slimline housings.

Features:

• Made with FDA approved materials
• Fits 20" Big Blue Housings
• Uses Resintech SIR-900 (activated alumina) media
• Flow Rate: 0.2 GPM
• Capacity: 2,500 Gallons
• Made in the USA

Fluoride reduction is flow and pH sensitive. Best results with this filter are obtained at a flow rate of 0.2 GPM and an influent pH of 5.5. Higher flow rates and higher or lower pH causes a significant loss of capacity.