My ac 110 was flowing a little slow, even after a cleaning, so I ditched the foam sponge. I bought the poly pad at Wal mart in the fabric section and cut blocks out to fit the ac; 2 blocks will make up the size of the foam sponge. The water flow was excellent, even better than when it was new. Plus I would have to say the poly fibers do a better job of mechanical filtration...

