Hello everyone. As always, I'm grateful for this forum. I have an unusual situation, and I'd like a little advice.
Background... I was heading out of town, and didn't have any bleach. So I crushed up about 10 trichlor tabs and put them in a floating dispenser. (I know, I know...)
When I came back, the pool was thick with algae. FC, CC and CYA were zero. The crushed up tabs were dissolved.
I added eight gallons of 12.5% chlorine, and nothing changed. That was last week, and the algae has just gotten worse.
FC, CC and CYA are still zero, pH is high (>8.2). Ammonia is 0.5ppm.
In the past, the 40,000gal pool has gone from 80 CYA to zero over the winter. I think the same thing probably happened here, and all that chlorine went to breaking the ammonia, leaving none to kill the algae. If so, the solution would be... more chlorine (isn't it always?).
Finally, it's probably unrelated, but my tabs all got wet this spring. I dried them out, but I have to approach the bucket with my eyes and mouth closed now because of the fumes.
My questions:
1. Did I diagnose the problem correctly?
2. How do I avoid having to deal with all my CYA turning into ammonia every year?
3. I have 'free' refill water - a super-low-nutrient canal. I have not significantly replaced the water in the pool for 6 years, when I replaced a quarter of it. Might it be worth just starting over?
Thanks for your help
Hawk
Background... I was heading out of town, and didn't have any bleach. So I crushed up about 10 trichlor tabs and put them in a floating dispenser. (I know, I know...)
When I came back, the pool was thick with algae. FC, CC and CYA were zero. The crushed up tabs were dissolved.
I added eight gallons of 12.5% chlorine, and nothing changed. That was last week, and the algae has just gotten worse.
FC, CC and CYA are still zero, pH is high (>8.2). Ammonia is 0.5ppm.
In the past, the 40,000gal pool has gone from 80 CYA to zero over the winter. I think the same thing probably happened here, and all that chlorine went to breaking the ammonia, leaving none to kill the algae. If so, the solution would be... more chlorine (isn't it always?).
Finally, it's probably unrelated, but my tabs all got wet this spring. I dried them out, but I have to approach the bucket with my eyes and mouth closed now because of the fumes.
My questions:
1. Did I diagnose the problem correctly?
2. How do I avoid having to deal with all my CYA turning into ammonia every year?
3. I have 'free' refill water - a super-low-nutrient canal. I have not significantly replaced the water in the pool for 6 years, when I replaced a quarter of it. Might it be worth just starting over?
Thanks for your help
Hawk