Quote Originally Posted by kahmeal View Post
1. The pressure on the filter reads ~10 psi upon starting and stays there or gradually gets to about ~15psi over time. From what I understand, this is too low.
Not necessarily. The issue is flow, not pressure.

The Kreepy Krauly automatic vacuum usually works but the suction seems poor and it doesn't move very fast. After it's been on for a little while it tends to get weaker. About 2 weeks after the filters have been cleaned the vacuum is nearly immobile until I clean them again. No noticeable change in filter pressure.
Dirty filters lower flow. Badly cleaned cartridges may need to be replaced. Low quality cartridges (most aftermarket cartridges) cause a variety of problems. This page will tell you how to clean, Cleaning-your-Cartridge-Filter-wiithout-Damaging-It!

Clean & ClearŪ Plus Cartridge Filters
Filbur FC-6475 Antimicrobial Replacement Filter Cartridge for Clean and Clear Plus 520 Spa Filter, 4-Pack
Unicel C-7498 Replacement Filter Cartridge for Pentiar Clean and Clear Plus (takes 4)
There are a LOT of bubbles coming out of the return jets whenever the pump is turned on after being off for a few hours. After it runs for a while there are still some bubbles coming out of the returns.
You have a suction leak. This can often reduce flow dramatically. And looking at the video, it's clear that you have a bad suction leak -- Vid cap:




One return barely works at all (farthest from the pump) and when it does it's mostly bubbles.
If you have normal flow, this means a piping problem - - often poor initial design and plumbing. If you have low flow, it may not mean anything.

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The skimmers have fairly poor suction, they don't pull debris into the basket much and there's no visible swirling.
This points to low flow. Try to find and fix the suction leak and see if that helps.

On your pool, the 4 places I'd check first are the pump lid, the pump inlet, and the (2) 3-way valves.








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There is a small leak at the PVC joint where the water comes out of the pump housing and to the filter; This seems to be past the suction side so I am not sure if air is still getting in here.
Suction leaks leak AIR INTO the piping; pressure leaks leak WATER OUT of the piping. Suction leaks reduce flow; pressure leaks, unless they are huge, do not. The leak on your pump effluent piping is trivial.

When I took the pump apart to lube rings and make sure the impeller didn't have anything stuck in it, I noticed there were small cracks or what appear to be slits caused by chafing in the plastic housing that goes around the impeller.
All normal.

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But . . . you need to take care of your mustard algae in the pool:




and the spa:



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And, you need to check on this crack:



before that part of the deck falls into the pool.

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By the way, you have an old Sta-Rite MaxEGlass or Duraglass pump. The AO Smith info is the motor, not the pump. Here are the manuals.
http://www.pentairpool.com/pdfs/maxeglasDS.pdf‎
http://pentairpool.com/pdfs/S691.CMax-E-Pro.pdf
http://www.pentairpool.com/pdfs/DuraGlasOM.pdf
http://www.pentairpool.com/pdfs/DuraGlasIIOM.pdf