I've only recently found TFP and I've probably learned more here than from any other source, and we've operated our pool for about six years! Fighting it all the way. So, I hope someone can help me with my latest problem. I have a Hayward EC 30 DE filter and the check valve needs replaced. I have the replacement valve but I don't know how to get the old one out. It seems to be either very tight or glued. Does anyone have any hands on experience or know how on this repair? Your help will be greatly appreciated.