Opened my pool last Friday, vacuumed to waste twice to get rid of the big stuff (mesh safety cover + opening mid-May = recipe for pea soup)
Fired up the filter in filter mode Friday evening, kept FC at shock levels until Monday (and FC is in fact still high)
Current chem test (22K vinyl IG, using BBB method):
FC - 5
TC - 5
pH - 7.4
CH - 90
Alk - 90
CYA - 0 (Ive added some, guessing it hasnt "shown up" just yet)
So basically the chemistry looks good. Even with 0 CYA the FC is holding (its been cool and cloudy ever since I opened the pool, go figure), plus I added some so it might just not be reading yet.
Here we are a week later and the water is still cloudy. I can see the bottom, but not like Im used to. Ive had the water clear enough that you could read the writing on our (now gone) main drain cover. We had the liner replaced last year and along with it the main drain was removed because it was leaking. The installers added another suction line in the deep end located in the wall (so yes, maybe we dont get as much circulation in the deep end now? but i had no trouble keeping crystal clear water all the way to the bottom last year)
Pool store (oh the humanity!) recommendation is to replace the sand, since everything else seems OK. The sand has been in use since 2003 when we opened the pool.
Im wondering what else I might look at? To me it doesnt seem like a chemistry issue. I wouldnt know what else to try OTHER than at least taking a look at the sand (maybe its channelled, but I figured Id see other symptoms of that). Only notable thing in regards to the filter is that I seem to have "lost" a couple PSI, running clean at 9-10, usually runs clean at 12 or so. No air in the lines, not losing water, etc. No leaks around the filter or pump.
Any ideas would be appreciated.