So I'm thinking of replacing my DE grids as I have some broken pieces on the tops of the grids where they join the manifold (the grid fits snug but 3 of them are missing all or part of the plastic top that goes into the manifold). It's a Pentair FNS plus and the previous owner or pool maintainer highlighted the first column with specs on the 24SF model. I start researching the replacements and notice the 24 SF replacements are all listed as 12" tall Mine are ~24" tall so its a 48SF one right?
Now for the embarrassment of self by admitting this. In getting the pool opened up for the upcoming season I was having my pressure rise a lot even without much DE in the filter so I read up here on DE maintenance and do the prescribed TSP wash followed by the Acid wash...I've got it set up next to the pool and I know my PH has risen a little in the off season so without really thinking at the end of a long weekend, I dump the solution into the pool.
It took a couple days before I got out my new TFP kit and tested the Ca at 570 (after draining and refilling last year due to high CYA and Ca after finding this sight), I thought it was high given the drain, but in Socal we do have high Ca source water (220). Then it dawned on me what a dummie I was...all I did was move the CA from the grids to solution and back into the pool. D'oh!
Now I have to decide if I drain and fill again or wait another season