I have this algae that's starting to grow, and my water results don't make a whole lot of sense to me. This is likely due to my ignorance more than anything else, and I'll say up front that I do not have a complete test kit. That is being remedied as I type this.
FC : 7 (I try and shoot for 6, since the pool calculator recommends between 4-8) I use chlorine bleach 6% as an additive.
CC : 0
TC : 7
CYA : 50 ( I overshot on the addition of CYA this year, but since the recommended levels are between 30 and 50, I didn't sweat it too much. Last year I had it right at 30)
Temp : 72 degrees. Went up to 75 last week.
pH : 6.3
What in the heck? How did my water get so acidic? I'm going to be adding baking soda today, and I will have a total alkalinity test shortly. Not that it makes a whole lot of difference, but the tap water out of my hose reads pH at 7.4. I've added water a few times this year. I've also had a drain a couple of times. We don't have acid rain here that I know of. And hypochlorite is basic not acidic - and the levels are, and have been within the desired ranges. Not sure where the pool full of battery acid came from. This is my fault because I haven't been testing for anything but CYA, FC, and CC. Never thought a whole lot about my pool water getting that low of a pH.
Back to the algae - how is it growing? The reason this is weird for me is that most of the threads I read involve algae being in the water AND on the walls, floor, etc. The algae I have is only on the bottom in a few spots around the edges. The water is crystal clear and has been all this season. You can scrub it off and it's right back the next day. It's not getting any worse, but it's not getting any better.
Any information to help me out here would be appreciated. As I said, I'm going to be up a TA test kit now along with a lot of baking soda.