Never used DE powder before. I'll try that maybe today. Will 2 cups of DE powder increase the pressure too much? I've been reading some of these threads and it says to add 1/4- 1/2 cup. My sand and the guts of the filter are brand new last year. I had to replace that center piece because it had a broken "tooth" and sand / debris were getting back into the pool. The algae left in the pool after vacuuming and shocking last night looks like dead algae right now. I had the chlorine up to 17.5 last night and it is at 15 this morning. I'm going to put it back up to 17 and try and keep it there. I'm thinking I didn't shock long enough the first time.
Thanks and I'll let you know on the DE powder.