Day 23
Overall clarity is still improving slowly. We can now see the faint outline of where the main drain is in the deepest part of the pool. Unfortunately this means that the staining is becoming more obvious as well.
I tried placing a half dozen vitamin C tablets onto one of the stains and they had no real effect so I am fairly sure that the stains aren't iron/rust based and are just really deep set organic ones from the months that the dead vegetation sat on the bottom of the pool.
Here is a comparison of what a stained area looked like both before and after I placed a half dozen tri-chlor pucks on the same spot yesterday afternoon.
Before
After
Aside from the lighting and improved water clarity differences you can see that there was little to no change in the areas exposed to just the ultra-high SLAM levels of free chlorine (38-40 ppm) versus the spot that became cleaner where the tri-chlor tabs sat on it for about six hours.
So unless someone has a better idea, it looks like if I want the stains gone I will have to either add some insane amount of bleach to the pool (50-100 gallons) to try to bring the FC up to several hundreds of parts per million and see if that can dent the staining or else coat the floor of the pool in chlorine tabs or granules.
Overall clarity is still improving slowly. We can now see the faint outline of where the main drain is in the deepest part of the pool. Unfortunately this means that the staining is becoming more obvious as well.
I tried placing a half dozen vitamin C tablets onto one of the stains and they had no real effect so I am fairly sure that the stains aren't iron/rust based and are just really deep set organic ones from the months that the dead vegetation sat on the bottom of the pool.
Here is a comparison of what a stained area looked like both before and after I placed a half dozen tri-chlor pucks on the same spot yesterday afternoon.
Before
After
Aside from the lighting and improved water clarity differences you can see that there was little to no change in the areas exposed to just the ultra-high SLAM levels of free chlorine (38-40 ppm) versus the spot that became cleaner where the tri-chlor tabs sat on it for about six hours.
So unless someone has a better idea, it looks like if I want the stains gone I will have to either add some insane amount of bleach to the pool (50-100 gallons) to try to bring the FC up to several hundreds of parts per million and see if that can dent the staining or else coat the floor of the pool in chlorine tabs or granules.