I'm using the TF-100 and my pool finished construction in mid-late August (details in sig). My CH since startup has always been ~100 and my CYA was ~50. I recently spoke with my PB about this and they sent out a crew to increase the CH and CYA both. My numbers now are:
My FC is high because I tested earlier today and showed 0.0 FC and CC so I dumped in 2 jugs of Chlorine (probably shoulda just used 1). A test a week ago showed 5.5 FC and 0.0 CC. Obviously this shocked me and I discovered that my SWCG was putting out a Low Salt warning and reading 0 PPM salt. I know this isn't right since I've tested w/ the salt strips and am ~3700 PPM of salt. The SWCG has been working fine until now. It either took a ****, or the recent addition of CH and CYA messed with it (is this possible)? I'm kind of kicking myself for even asking the PB to adjust my chemestry since they overshot the CYA (he said he wanted it to be ~80) and seem to have way under-shot the CH (not to mention screwing up my SWCG).
Anyway, putting these numbers into the pool calculator says I'm at a CSI of -0.34 which says is at risk of plaster corrosion. Is this still a risk w/ PebbleTec? It looks like I'll need to bump my CH up to ~420 to get a good CSI. Is this the right thing to do? Anyway, looking for a little guidance here... It's my first pool and this website has been a huge resource.