Hi - I'm new here but I'm quickly finding my way around. I appreciate having access to such a helpful site.
I have a Jacuzzi LaserJet sand filter and I had sand returning to my pool. Since it had been a while since the sand was changed so I changed out the sand. While doing so I checked the laterals which were fine, but noticed that at the bottom of the standpipe it was completely open. Does this rely on pressure applied to the top of the standpipe to keep it seated at the bottom of the filter, or is there supposed to be some kind of covering on it? I ask because I put in the right type (#20 pool sand) and the right quantity and it is still blowing sand back into my pool. Not just a little sand -- I think I'm up to one of the 50 pound bags I just got through putting in the filter.
As a additional question - does anyone have any good tips on getting the sand out? I don't know if it will torture my pump to run it through to waste, and a shop vac is out because of the depth of where most of the sand is (about 10 ft deep).