Long story short. I have very little confidence the pool builder we used. It seems our Cristal-Flo II 3.15 sf allows a fair amount of either sand or silt through the filter and back in to the pool. I suspect it's silt because when brushed it disperses easily (my readings here indicate that is likely silt and not sand). Also, upon pump start up all returns have a light brown cloud shoot into the pool for 15-20 seconds. My suspicion is that original set up of the filter was not optimal. Either not enough sand, too much sand or damaged in the process. This builder had a couple of real hacks working for him and I happened to walk by and see the worker putting sand into the filter. He was struggling and seemed very frustrated by the process. I would not be at all surprised if he got the absolute bare minimum in and gave up (seemed to be his MO on everything he did). Two questions, would too little sand create a condition of poor filtration and allow more silt through than the correct amount of sand would as well as the brown plumes I see on start up and, (what I really woud like to know) if I were to pull the multi valve and visually inspect, how much or what depth should the sand be (looked online but only found volume references)?
The pool is one year old, Pentair VS pump, sand filter, has automatic cover that is closed most of the time. I can close the cover with the pool clean and when I open it there is always silt on the bottom (sort of lines of silt). Robotic cleaner mostly has silt in basket after cleaning. I'm hoping to inspect and find sand level borderline or low and bring up to spec and cure problem. Any input would be appreciated. Thanks!