Re: Treat water or drain?
Just a note, to let folks know how things ended up with my green pool (with high CYA of 100). I talked with the City about the water. They asked me not to drain half the pool, because of the drought, and the water restrictions they are currently enforcing. Since I was going to be out of town for a week, I decided to let the algae go and see if it would consume the CYA. When I came back on 7/25, my numbers were:
TC: 0.0
pH: 7.8
TA: 210
CYA: 100
The CYA didn't drop, although the pool was really green the entire week, according to my kids.
I went to the local Sam's, and bought as much bleach as would fit in my car. I started pouring it in, until I reached 20 to 25 ppm using an OTO kit with 4 parts distilled to 1 part pool water. And then I kept it there, three times a day, and brushed once per day. After using 11 jugs of chlorine bleach (6%, 1.4 gallon each), the pool water is clear. First time I've seen the bottom in I don't know how long (years, probably, since I used to use Bacquisil, so the pool was always a bit milky). My only issue is that I still have 7 jugs of bleach left, and my wife wants it out of the kitchen ...
My numbers this morning were:
TC: 20.0
pH: 7.0
TA: 180
CYA: 100
Currently, I'm using dry acid to try and bring the TA down a bit, which is why the pH is lower.
I'm planning to let the TC drop by itself to around 10.0, and then keep it there.
Thanks for the good information on this forum. Sorry I didn't take your advice and drain half the pool. I'm thinking about draining early next year, when I open the pool, if the CYA is still at 100. Unless we are still under water restrictions ...
Re: Treat water or drain?
Jim,
Thanks for the update. You did what you had to do and reached a successful conclusion. I partucularly like that you recognize the need to maintain the 10ppm Cl level. I doubt you'll have another issue all Summer.
Read Ben's Sticky "Lowering Alk...." in that forum. Dry acid is not very successful. His method is. Happy Swimming.