tested and certified by wqa for the reduction of chlorine?? taste and odor. It also reduces particulates (based on manufacturer testing)</br>? use only with Honeywell filtration system model Hwb101</br>? included in the box is both the resin and carbon filter that need to be replaced at the same time</br>? filter life of 132 gallons (approx. 6 months depending on water quality and usage)</br>This is a Honeywell replacement part</br>Part Number HWB101B?? HWB101S?? HWB101W</br>This is an O.E.M. part</br></br>Product Description</br></br>Honeywell HWF101AB replacement filter for filtration system Hwb101 series; filter life of 132 gallons (approx. 6 months depending on water quality and usage).</br><br/>http://www.amazon.com/gp/product/B0116ZOTDG