First off all I'm happy to have joined this forum and look forward to assistance from pool knowledgeable members.
I had a new pool company start this week and do a filter clean this past Saturday. The cartridges were disgusting to put it mildly and even after a thorough washing they remained brownish (see pic below, only 3 of 4 pictured). The pool was put in in 2009 and we have been in the home roughly a year. The technician suggested I see how they perform after the cleaning, but I'm wondering if I shouldn't just start from zero since I don't know if they have ever been changed. There has been a considerable amount of blow-back in my pool though I always assumed it was flagstone shedding around the coping. As he cleaned it, I realized the gunk was the same thing that was settling on the bottom of my pool almost like a fine silt.
I'm getting air bubbles through one of my return jets. It started out as tiny bubbles and now sounds like someone gurgling. I don't have a backwash function on my equipment so I can't perform one. Oddly, my waterfall basket pump cover remains full of water to the point it looks clear when looking at it through the pump cover, but my main pool pump never hits the top clear cap and surges almost like a clogged toilet then recedes a few seconds and surges again. I have a pool tech coming this week to assess, but I don't want to get taken for a ride. Has anyone had this happen before?
Here is photo showing my setup, and a link to video showing what happens as the surge occurs both closeup and from overlooking the pool itself.