In my opinion you'd be better off refilling the filter with Zeolite. Has filtration properties similar or better than DE down to 2 microns. When re-filling the filter you only use half as much media. Our 26" filter requires 350lbs sand but only took 175lbs of Zeolite. We've only had to backwash once in the 4 months we have been using the pool and we use it almost daily. Water is crystal clear.