I've been a lurker on this site for a while but never really had a reason to post any questions until recently. I'm a newbie pool owner, and learning as I go. I closed up my in-ground pool last winter and I think I made a big mistake... I realized that I left the drain cap screwed in after I drained the filter. That's not good since I live in Maine. I opened the pool about a week ago and I've had a steady leak at the base of the filter while it's running. I can't spot the leak because the base is in the way. The leak appears to stop when the pump is off.
I replaced the drain pipe today (hoping the pipe had some sort of a crack) and it doesn't appear to have fixed anything. The old pipe looked fine to me. Don't think it was an o-ring issue.
I guess my question is, what is my next step for finding the issue? I'd like to pick up the filter and look underneath it, but it's got 200lbs of sand in it, and I know I can't tip it on it's side. Does it sound like I have a cracked casing, or could it be something else? I'd like to avoid buying a new filter but I'm convinced I'll have to at this point. Thanks in advance.