This ResinTech water softening resin is a replacement resin for all major softener brands . The 10% cross link resin is a higher strength resin than the 7% or 8% cross link resins found in most softeners. One cubic foot of resin has 32,000 grains of capacity. This resin is ideal for homes or businesses on city water supplies and for well water with less than .5 ppm of Iron. This resin is USDA, NSF, FDA and WQA approved.