adjust cya before or after shocking

[Kateyru]

I have a question. I'm at the point where I am adding CYA (granular) to pool water. It's in a stocking and hanging in front of a return as of late yesterday afternoon. Do I need to run the filter/pump 24/7 while CYA dissolves or just run the usual 8 hours? Btw, water is looking good, and FC = 5 and pH = 7.6 per most recent test.
Thanks.

[BigDave]

Hey, happy to hear from you, I'd been wondering how the algea battle finished up. Glad to hear it's looking good.
Run your pump on it's regular schedule. Give the sock a squeeze now and again to help it along.

[Kateyru]

Good, glad I can cut back on pump time, and I'll squeeze prn. Many thanks again for all the help!!

[Kateyru]

Well, I'm back with another question...I just tested (5:45 pm) and got FC = 11.5 and pH = 7.6 (holding steady). My FC is up from 5 in 48 hours. I added salt and may have gotten a little heavy-handed. Hayward recs 2700-3400 and I'm at 3900. I'd set SWG at 45%. Is the FC up because of too much salt or is % too high? Other thoughts?
Thanks.

[BigDave]

I don't know if extra salt makes extra chlorine - I doubt it, but if your chlorine is climbing, you may want to consider reducing the on time of the salt cell or the % on the salt cell.

[PoolDoc]

I just tested (5:45 pm) and got FC = 11.5 and pH = 7.6 (holding steady). My FC is up from 5 in 48 hours. I added salt and may have gotten a little heavy-handed. Hayward recs 2700-3400 and I'm at 3900. I'd set SWG at 45%. Is the FC up because of too much salt or is % too high? Other thoughts?

I don't think the salt is a problem. But, what is your CYA level, and how are you testing. I saw mention of an OTO kit; do you have a K2006 yet?

FC = 10+ is too high, if your CYA is below 40 ppm, unless you are having algae problems.

[Kateyru]

sorry to report that I am back with algae problems. My test results at 6:30 pm today were FC= 6, CC = .5, pH = 7.4 and TA = 70. I've been adding CYA through stocking since the time I thought I had previous algae problem resolved. I was out of town for a week but tested on 5/4 and pH was 7.6. I starting dosing again with CYA on 5/5. I'd turned my SWG on again when I thought algae problem was taken care of but FC had stayed high 11, 10, then 9 on 5/5 so I turned SWG off. So,without SWG, FC was coming down and was at 6 today. But now I have algae again): What caused it? Is it because I forgot to test pH and keep it at 7.5-7.6? Should I have left SWG on? Trying to figure out where I went wrong. Also, do I need to raise pH before I shock again? I plan to use bleach to shock.
Thanks.

[aylad]

If you have algae again, it's because you either 1) let the chlorine get too low, or 2) never killed it off completely before allowing your chlorine to come back down. It has nothing to do with your pH. Your pH is fine where it is--you just need to raise your chlorine back up to shock level (best to do that with bleach instead of your SWCG). How high shock level is depends on your current CYA level. Do you have the test kit yet so you can test your CYA?