we just had our tank overflow because of clogged filter, so off comes lid, grab handle of filter, pull up, and guess what, T is attached too close to sidewall, won't come up because of rounded lip of tank. I managed to get shop vac crevice attachment in to suck filter clean, but that's sure a pain. anyone think I could dig down outlet side, cut pipe and push in an inch? 20 year old poly tank. I don't know if there is a gasket, or a formed stub out. if gasket, do you think I could get it to move after 20 years.