I even brought pictures! And if you read all the way down there is probably a funny story.
So I have replaced my cartridge filter with a sand filter. However, because the inlet and outlets are in different locations, it required me to redo the plumbing. There are a few drips with the new pipes in places (can those be caulked?) but the water coming out of the filter in the pipes, the pipe vibrates, so I don't know if there is too much pressure with the way I have it now, or if it's because it's somewhat "floating", if that makes sense by the pictures.
I am apparently over my attachment quota but the link to the original plumbing is here and the new plumbing is here
In hindsight maybe I should have used more gently rounding curves to connect the filter to the heater, but I was working with the existing plumbing and joints that I already had. My mind works in right angles not curves! If this fails, is there a flexible tube/pipe I can use instead of rigid pvc?
Also, there is a small but steady trickle of water coming from the backwash port when the pump is running. This just means new spider gasket, right?
Ok so story time if you care. The section between the filter and the union between the filter and the pump. When I had cut all of the pieces, I put them together to make sure they were all the right size and fit correctly before I cemented them. That particular section, primer had spilled on the pipe and the fitting into the filter, so I could not pull it apart to actually cement it. When I turned on the pump, it worked for about 3 seconds, saw water returning into the pool, and then that section of pipe came apart, in a glorious Mt. Vesuvius fashion, completely drenching me. It was also drenching the pump cut off outlet, and I was very nervous about reaching under the cover to shut it off, but what could I do? (spoiler: I wasn't electrocuted.) Once it dries I primer and cement that section, let it cure. The next day I go back out (bringing a shield with me in case I need to block the water to access the pump shut off.) and I turn the pump on again. Once again water erupts, but this time from the part of the pipe that goes into the union! Apparently I didn't cement either end! So I dried it off, cemented it, tried it again, all working! Hooray!