First time opening a pool - putting all the plumbing back together, and everything seems fine (put the 2 plugs into the pump, got all the piping connected, etc). Water flows fine out of the pool in "waste" mode, but when I flip it over to the "filter" setting, water starts flowing through the heater and the drain plug in the header squirts water out of the hole in the middle.
I have the pressure control module, or whatever that part is inside the heater, installed, and it seems like everything should be fine. The drain plug is hollow and has two holes on the side of the "inside" end of the plug, and water just pours through there. I'm not sure what I am doing wrong? I asked the guy at the local pool shop and he recommended a couple of wraps of teflon tape and then just hand tighten it in, which is what I've done.
Thanks for any help!