Last night we had 3.5" of rain....this morning my pool is at normal level. The multiport valve on the Jacuzzi Laser 190 appears to be leaking through to the waste/backflow port. It's 25+ years old so it doesn't owe me anything. I'm leaning toward replacing the whole thing at the end of the season, though location is a challenge. Replacing the multiport seams feasible, but is it really an economical choice? The equipment is under a deck, access is limited, plus I need top plumbing connections so replacing it with another sand filter is a more logical choice than a cartridge, even though getting the old one out will be a chore. Is there any way to determine if, or how much, water might be leaking around the sand? I did use some fiber to remove dissolved iron two weeks ago and saw no evidence of the fiber coming from the return. My leanings right now are toward a Pentair (just replaced my AO Smith pump with an Optiflo, seems to be a well designed and manufactured product) but are there really any significant differences between sand filters?