Decision on Zeobrite or Sand replacement

[TMan]

Dave,
I think there may be some calc precipitated out.
I tested about 3 days after I went back to regular chorination (during/after sand change my FC was +15) and we went clear.
According to my handy-dandy ps233 -
FC=3.5 CC=0 TC=4 pH=7.8 Alk=190 Cal=240 Cya=0 (week ago)
I retested 2 days ago FC=4 CC=0 TC=4.5 ph=8 Alk=210 Cal=270 Cya=20

The calc is coming off with a green pad but the 'gentle wipes' in some spots translate to "you gotta scrub".
Since I run a SWG my ph is always high, and were in central TX, nothing but the best mineral water in the west. Filtered by the limestone rocks and pumped out of the aquifer, clogging shower heads and coffee pots in a city near you!

Anyway, I'm not looking for quick fix, I know this will take work, But if you know of anything that could help soften up some of that calc to make it easier when scrubbing every inch by hand please pass it on.
Oh, and since were very far (weatherman says ~20") behind in rainfall for 12 months running, every week I just add more of that mineral water back to the pool for top-off, durn.
Thx all,
Tom

[duraleigh]

Hi, Tom,

I wish I could offer some practical advice for getting whatever it is off the wall.....I just have no experience. Home Depot sells "sulfamic acid" a very mild acid for cleaning masonry.......I just don't know if it would have an effect on your liner if you brushed a little on. Smarter folks than me may have an opinion.

Yeah, your pH and Alk numbers are up there pretty high.....very conducive to scale formation. Adding some muriatic acid would help a lot

I believe I would work on reducing pH to around 7.2 - 7.6 and Alk down to the 90 -120 range........that would probably prevent you from ever geting back into that scaling condition.

I have asked several pool stores about adding DE to the sand but they never heard of it. Though they have heard that their $23 Sand Filter Cleaner works well ;-)

Sounds like your water is looking pretty good....nice work. I do believe you need to add some muriatic, however.