I have gotton much good info from a thread on another topic. I wanted to bring over here. Long story short- Let my Cl get low, started to get a little slimy algae- TA was around 40-, PH high. Added 14 lbs baking soda. Numbers were:

FC- 5.0
TC- 5.0
PH 8.0
TA 110
Hardness 190
CYA 40

No sparkle to the pool kind of cloudy looking.

To kill algae I raised CL to 15. I have been in the cycle of rasing with Baking soda (since TA was at 40) then lowering with acid.

Oh yeah 30,000 gal Salt water pool, vinyl lined.

This morning-
CL 13-15
TA 70
PH 8.0+

I know a salt pool will raise ph, but it's swingiong wildly- look at my TA over a 3 day period- 110 to 70. No wonder I have no sparkle! I run pump 24/7. I put in 1/2 gallon of acid this morning per the calculator. OK- If I get my TA back up with baking soda, then lower my ph with acid, I'm in an endless circle. What steps would you take??