Product review (1 stars): Does not work. Manufacturer guarantee is bogus.
Do not buy this filter. It fit fine as a replacement for an authentic GSWF; however, there was almost no water flow. I tried shaking it, banging it, soaking it in water for 2 hours, but still almost no water flow. I contacted the seller who sent me to the manufacturer. it is supposed to be guaranteed; however, I could not get the manufacturer to respond to my inquiries and guarantee claims. I sent several messages online, no response. I called the 800 number and left a message, no response. Stay away.