I guess its a Jacuzzi "FM" iirc, std. beige type (24 000 gallon inground pool) filter {tank} not a fancy shape, with a ~1/2-2/3hp pump. Pump and tank seperate. Must be 10-15 years old. It runs fine, but lots of bubbles shoot out deep end output jet as well as water. Water doesn't leak outside, maybe around head bolts. Never changed sand - don't know if I could. Never frozen. Vacuums poorly now, must do on backwash, and that needs re-priming. Ends up needing re-priming after a week or two of cycling- no suction hardly. I do pick it up by the exhaust line & recycling fittings every year to move and store it. I don't think this is the reason it is getting the air in though. I don't know where it is coming from. Had a great suction not a few years back - created its own great flow - hardly a bubble. The drain at the bottom is tight I think, and I'ver gotall new hoses with 2 or 3 SS clamps. It does have a new chip out of the plastic rim where the clear plastic pump cap seals, but the O-ring is supported through 360; so??. Can't imagine anything wrong with the hoses in the ground, always use antifreeze, and drain. Betcha runs like a charm with a good seal. So.
I'd really like to get back a perfect flow, no leaks, no air out, and good vacuum.
Can I reseal the head? Its got a ring of half a dozen bolts. Can I do this in an afternoon?