We have had our pool since March and since May I have been struggling with the pool turning green (not swamp green, but not pretty clear water).
I tried using bleach for a week, but was having to add so much that I have gone back to chlorine tabs, which I know lead to higher levels of CYA. Would like to go back to something without the added stabilizer, but not sure what steps to take. I am new to the TFP method and would really appreciate some guidance.
Here is my info as well as I understand it.
In ground plaster pool with a spa. Sand filter.
Numbers yesterday were:
I added 22 oz muriatic acid per pool math instructions. 8 hrs prior to testing yesterday I added a bag of shock that we had on hand.
I have small patches of green algae on the limestone steps and seat in the pool. No algae in the spa. The algae scrubs off easily with a wire brush.
Do I need to SLAM? When I read the CYA/Chlorine chart and it has shock level of 39, does that mean that my FC needs to be at 39? Is this going to be an ongoing problem due to CYA levels? Also, why is CYA level so high after only 4 months of pool operation? Can the tablets cause that much build up in 4 months. I am hesitant to drain the pool at this point as we are in drought restrictions and I believe will incur a hefty surcharge if we refill. I would appreciate any help that you can offer!
Pool 1.JPGPool 2.JPG