Need help w/test results

[The Mermaid]

OK, here is a little background. 28ft AG pool w/paper cartridge filter. The pool is old. We had a piece of the plumbing hardware break a couple of weeks ago and we were not able to find a replacement. So hubby and I decided next year we would just replace the pool. We planned to dismantle everything this fall when the weather got more tolerable. But now we've had a change in plans. We've decided to keep using this pool for a couple more years, but since the pump hasn't been running, now we've got algae. Hubby figured out a way to repair the original problem so now we have the pump and filter going nicely, but trying to get rid of algae.

I figured the first thing to do was add bleach to shock levels. I've always heard that cya levels don't fluctuate much if you're not adding cya, so I added what I thought was enough to take levels up to about 15ppm with CYA of about 35. This is how it tested 2 months ago. I let that circulate and tested.

FC = 15.5
CC = 0.5
TC = 16.0
PH = 8.2 (could be higher that is the max on my test)
TA = 90
CYA = 0 (WTH????)

So I want to get rid of algae and get my water balanced again. Temperatures here are in the 70s in the daytime right now and drop down into the 50s and 60s at night.

I know my FC is a bit high, but the pH is really high!!! Also, how did my CYA drop from 35 to 0 in just 2 months? Evaporation and rainwater???

What do I do next? Just maintain shock level and filter until algae is gone? Should I be adding acid to lower the pH, or wait until the algae is gone? I figure if I throw in a few pucks to get my CYA back up, my pH will get lowered anyway, so maybe I ought to add pucks before fiddling with pH????

Any help is much appreciated. Pool holds about 22,000 gallons. It's above ground but has a dished out bottom that is deep.

[duraleigh]

Your post is a little confusing. How old are the test results?

[The Mermaid]

OK, sorry, I know everyone here is a stickler for details, but maybe I included too many.

The test results posted are from yesterday after we got the pump running. Would like to clear the algae. The pH is high and the cya is low. My question is, in what order should I correct these things? Get rid of algae first, then increase cya, then see if the pH needs to be tweaked? Or do I need more stabalizer in order to efficiently fight the algae? I'm adding cya with pucks which is slow. I was shocked that my cya was 0 when 2 months ago it was 35.

[aylad]

The algae is probably what broke the CYA down...that tends to happen when there is a bad outbreak. For now, get the chlorine up to 12-15, and keep it there by retesting and adding more 2-3 times daily until the water goes to blue/cloudy. While you're doing this, keep the pump running 24/7 and brush the pool at least daily. When the water goes to blue/cloudy, continue to run the pump to get the dead algae filtered out (this may take several days), but watch the pressure on your filter and rinse cartridges as needed. After the algae is cleared up, then add your CYA.

Janet

[The Mermaid]

OK, thank you very much. I thought that's what I should be doing, but have never had algae before (thanks to BBB) and just wanted to make sure.

[duraleigh]

Mermaid,

Simultaneously with Janet's advice, I would get your pH down around 7.2 - 7.5. You'll need muriatic acid to do that. Start with a quart and retest in an hour or so (pump running). You'll probably need a second quart.

[The Mermaid]

Duraleigh,

I've got some tri-chlor pucks dissolving in there now (for the stabilizer). I know it will take them a few days to completely break down, but they always lower my pH and raise cya. I was trying to avoid lowering pH now, then having to raise it again after the pucks dissolve. Do you think the pH is really that urgent right now? I honestly have no idea. What sort of bad stuff does high pH do? Does it happen quickly?

Melissa

[The Mermaid]

Oh and also.... I was trying not to add acid and chlorine at the same time b/c of poisoneous fumes. It seems I'm adding chlorine VERY frequently right now, so if you still recommend acid for pH, how much of a time lapse should there be in between chlorine dose and acid for safety purposes?