Hi nomar,

I'm so sorry this thread got overlooked!! I hope you're still around.

I know this is way, way late, but just looking at your numbers, I would say the following:

Check the instructions for your SWCG, but most of them want your CYA to be around 70-80 to make the cell work more efficiently. That alone may help your chlorine output.

When adding acid to lower total alk, it needs to be added all at one time. If you add a little at a time over several occurances, it will lower the pH but not do much for the alk. What you need to to according to these numbers is to either aerate the water or add Borax to raise your pH to7.6-7.8, then add enough muriatic acid to drop the pH back down to NO LOWER THAN 7.0. With this pH drop, your alk will also drop. Then aerate the water so that your pH rises again, but the alk will stay lowered. When the pH gets back up into the mid to high 7's again, then you can add more acid to drop it back down to 7.0, further lowering your alk. It's a ratcheting process and takes a little patience, but it will work. The good news is that pH rises in pools with SWCGs naturally, so hopefully it won't take too long to get the pH back up after the acid additions.

After you're finished with adjusting the pH/alk, then use bleach to shock the pool to get rid of any remaining algae. What is the total gallonage of your pool? And is it vinyl, gunite, plaster.....?

Generally when fighting an algae bloom, it's best to do that with bleach instead of depending on your SWCG to do it--it will wear out your SWCG too early--it's more made for maintaining chlorine than generating large quantities of it all at once. Once you get the alk where you want it, the CYA up higher, and the pool shocked, then you should be able to go back to chlorine maintenance with just the SWCG and be all ready to go for next year!

Janet