It lets way to much through. A lot more than a furnace filter does. I just thought It would be good for the enviornment and to save on buying the filters by just being able to hose it off. It cost me about $40.00 with two bottles of stuff. guess I will just cut my losses since it is big and bulky to send.
Hey dgman.... I just said I took it back and got a different one. One just assumes I didn't like it