It's getting much cooler in TX recently and I am considering to close my pool, drain the water, and paint the pool since the old plaster is worn. Yet my water level keeps falling recently - I had an original pump station with a Pentair multivalve that lasted for 20 yrs. I replaced the gasket couple months ago but found out that it does not fit well and one branch always stretches out of the groove after turning on the valve. And there is also a noticeable crack on the bottom of the top assembly - where it fits with the gasket. I guess when I turned to filter, there are water constantly moving from that branch to my drain and therefore causes water level to fall. So I am thinking of replacing the whole valve. From what I understand, it may involve some plumbing etc. Can anyone share some experience with the replacement of the whole assembly valve? My model is SM2-20-2. It's for a 60 Sq ft SE filter & 25,000 Gallon pool.