First off...FABULOUS site! Great info and great moderators from the reading I've done.
I've got a pool that algae growth is a constant issue. I'm in South FLorida, so needless to say, temps run in the upper 80's to upper 90's much of the year, and now...well, **** comes to mind. I know that plays a roll.
My pool is a marcite finish inground and volumes out to around 19K gallons. I've got a canister filter/paper cartridge as well as a chlorine tablet dispenser in-line. I currently have been running the pump about 8 hours a day, but from what I've read, need to bump that to at least 12 (24/7 until it's right..I know). I have a Hayward Navigator automatic cleaner ( but not for long...more trouble than it's worth lately). I seem to consistently have an algae growth issue. If I don't brush a couple of times a week, its noticeable. Brushing of course yields cloudy water...all leads to an underused pool.
With that said, here is where I'm at. I cleaned the filter, vaccuumed and brushed, and cleaned the filter again last night. I added 2.5 gallons of the pool-store chlorine (Sun Coast brand if that helps). I let the pump run all night and day. I took water in to be tested today (buying a test kit as soon as funds are available to get a good one):
Stabilize (that's CYA right?) = 0
Well, I think it's obvious why at this point I have algae 0 chlorine and 0 stabilizer. I use chlorine tablets with stabilizer in them..I thought that was sufficing. Guess not.
They called for 7.5lbs stabilizer, 2.2 cups acid, and 2 gallons of their chlorine. I cleaned the filter, brushed, cleaned the filter and then I added the stabilizer.
Then I went to the pool calculator and the best guess CYA chart. I need to put my pool into shock, right? If I target 50 CYA (is that a good value for me?), then my shock FC needs to be 20, right? The best guess chart also suggests to lower the pH to around 7.2 to make the chlorine more effective. Based on the calulator, I need about 1 qt + 1cup of acid to get there. I did that. I'm going to check the pH in a few hours and see where it's at before moving on to adding the bleach (which I also bought tonight along with baking soda).
The calculator says to get my pool to FC=20, I need about 6 gallons of bleach. Sound right? Should I add this all at once or some now, check it, some more later or does that defeat the purpose of shocking it?
From what I've read, I need to maintaining the shock level daily until my FC is "Stable." Can someone define that please? How much of an FC drop overnight is considered stable? Once I reach that point, do I simply let my FC drop down to the recommended 5.7 value in the best guess chart (for CYA=50). Should I not be letting anyone swim until then? At what point do I bring the pH back up to 7.5? I also need to bring the TA up, so I'll be adding baking soda which will bring the pH up, right?
I think that's all for now Thanks VERY much!!
So, with all of that said, I'm I on the right track?