Joe M

Hello all.. i have the same problem. when my pump shuts off DE goes back into the pool. I have a brand new pump, DE filter, check valve and some various tubing. In the skimmer there is a valve that i can rotate and when i turn it all the way in one direction DE does not get in the bottom of the pool. but today i had the spa on and when i turned the pump off the bottom of the spa filled up with DE. i'm lost i have no idea what else to do. when kreepy krawly is installed there is bubbles coming in the pool and if i take kreepy out the bubbles go away... any ideas??? thank you all in advance.