Hey guys, I'm hoping you guys can help some. Yesterday I started my filter running for the new year, I bought it New last year. We initially filled the pool last year new with creek water so I went ahead and changed the sand this offseason. So with new sand I primed my filter, a good long backwash and rinse until it was clear, then switched to filter and everything was running fine at 15psi. I'm about an hour it has jumped to 20psi. I backwashed again and it was back to 16. Again it jumped to 20 in a short time and barely pumping water through. Can anyone help as to why it's doing this? For now I just have it running on recirculate with a chlorine tab in the skimmer, I didn't want to leave it on filter while I was gone today and have it do the same thing. Thanks for any help!