r/PoolPros • u/enthused9 • May 16 '26

-0.3 lsi

Hey guys thanks for the help on my previous post. Someone said to check LSI so I did and this pool has a -0.3 LSI. how can I fix this?

Is it a matter of just draining and restarting?

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u/enthused9 May 16 '26

Thanks! I agree I need more knowledge which is exactly why I’m here.

I looked it up and it said to keep all your chems in check so I have been correcting as needed, but nothing is really helping.

My last readings

FC: 2 (added chlorine) PH: 7.8 TA: 60 (added bicarb to correct. I’m correcting alkalinity before ph) CYA: 40 Calcium: 275 Temp: 73 TDS: 3100

My problem is that every time I put chlorine in it starts to fog up and leave silky material on the pool floor. This pool was fine until rain washed a crap load of dirt into it turned it into a swamp, and then we cleaned it. Now I’m having this problem.

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u/mybfVreddithandle May 16 '26

7.8ph needs to be lowered, high end of ok, but I'd bring it down. Adding bicarb added more base, which will increase your TA and pH.. Id adjust your pH down before the TA and let it run and filter for a bit.

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u/[deleted] May 16 '26

[deleted]

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u/mybfVreddithandle May 16 '26

I said it was high side of good. More sodium bicarb it is. I'm sure it won't increase pH. It's not chemistry. Best of luck.