Savio Skimmerfilter Mat

I buy 2 every year for 7 years. A new one goes in my skimmer, and the other one goes on top of a water fall. Mats last about 2 years. After 1 year, I place one in the front basket of my skimmer which doubles the filtering capabality and another one at the base of another waterfall. Using 4 filter pads at the same time in this way keeps my water much nicer and allows me to wait about 2 days between each cleaning when I spray each pad with a forceful stream of water to clean them.