I have never had this much trouble before!

[seminolewind]

I even changed out my sand, thinking after 6 years it was worn out. I did that yesterday.

[seminolewind]

CYA is 30, which is good I reckon.

[waterbear]

If you could post a full set of test results and some info on your pool it would make things easier to try and help you. Telling us your chlorine is a 'shock level' is really pretty meaningless.

[seminolewind]

TC 5.6
FC 5.3
TA 200
CA 190
pH 8.0

Thanks, I feel pretty meaningless lately too dealing with this pool.

[CarlD]

TC 5.6
FC 5.3
TA 200
CA 190
pH 8.0

Thanks, I feel pretty meaningless lately too dealing with this pool.

"shock level" for CYA=30 is between 10 and 15, not 5.3. See the "Best Guess table"

Your pH is too high. Get it down to the mid 7's before you add chlorine, THEN shock it to 10+ and keep it there. pH of 8 makes it very hard for your chlorine to work.

[waterbear]

What CarlD said!

[Watermom]

One other thing, your TA is too high. See the sticky in the alk forum for directions on lowering it. Aim for 80-100.