Hi. I have an 18 ft ag pool w/a waterways 19 inch sand filter and hayward pump. I posted a while back about problems with sand in the return line, thinking maybe I'd put in too much filter sand when I replaced it earlier this year. My kids are starting to look at me funny b/c I'm spending so much time at the filter trying to pinpoint where the problem is--I can hear a definite gurgling but there's no water coming from any connection on the filter or the pump. I replaced the 7 function multiport valve over the winter and it seemed like a really simple gig, but I *swear* that's where the gurgling is coming from! I can understand how a faulty seal in this piece would let sand into the return lines (sort of) but I'm clueless as to what I need to do to fix it and our budget really, really can't take on me screwing something else up so I'm really hesitant to start unscrewing stuff and messing around. How do I even begin to take the filter apart now that the pool is open and the water level is where it should be? Do I need to drain below the return line again? It also appears that the pressure gauge doesn't work--not sure if that fits into the situation or not. If anybody can walk me through what I need to do to troubleshoot or fix the problem, I'd be really grateful. With the boys out for summer, this pool goes a long way toward keeping Mommy sane. Thanks so much. --Leslie