This IPW Industries Inc. filter is compatible to the CW5-BBS polypropylene wound heavy duty filtration cartridge and works in Culligan model HD-950A whole house filtration systems Perfect for residential homes, helps protect appliances and pluming from sediment and scale Features a flow rate of 8 GPM Reduces: sediment, rust, scale, dirt, coarse sand, sand, fine sand, extra fine sand and silt Micron rating of 5 (the smaller the micron rating, the smaller size particle the cartridge will filter) Compatible with Culligan model HD-950A