Let me start off by saying hello, and it looks like you folks have a nice place here. I recently married into a very neglected pool. It had lived for a few years on nothing but pucks and super shock'n'swim. Last off season it was really let go. The filter had been on a timer. There was a nice layer of leaves/mold/gunk on the bottom when I started trying to open it. I took the cartridge out and it was nasty. I scooped and swept and filtered and finally got it mostly clean, and with the help of another forum (someone there pointed me here for my question) got the water perfect once again.
My problem is that when cleaned, the cartridge housing vibrates like nobody's business, and the gauge goes from 10 to 20 psi, up and down. It sounds like a vibrating sander. If I restrict the return with this little fountain thingy my wife loves, I can get the noise to stop, but the psi is at 20 (it runs 10 psi normally). If I vacuum up the normal accumulation of blown-in high desert dirt, I can open the fountain and the noise stays gone, but even a small amount of dirt raises the psi back to 20 and there is very little return flow. I've cleaned the cartridge very well, and have done the dishwasher cleaner soak too.
Could the steady diet of pucks'n'shock, coupled with the serious neglect, have rendered the cartridge un-cleanable? Would a soak in a muriatic acid solution help? I bought a Pleatco replacement cartridge that works quietly, but the top and bottom openings are a little larger than the Hayward, so it doesn't catch all of the dirt that's vacuumed up. I can't afford another Hayward cartridge right now, so I use the old one when vacuuming, then put in the Pleatco in between cleanings, but this routine is getting old. Can I revive my old cartridge? Help! And thanx in advance.