Did you put in any sequestering agent after the ascorbic acid? THe ascorbic acid only lifts the stain from the pool surface. You need sequestering agent to keep the lifted stain (metals) in soluble form - sequestered in solution which keeps them from redepositing on the pool surface. You never get rid of the metals - we are trying to see if there is an easy way, but so far we have no sure way. So what you are aiming for is to keep the metals from falling out of solution on the surface of the pool. High chlorine along with high ph levels will cause any metals in your water to fall out of solution, therefore they will deposit on the surface of whatever it can. Please read the sticky Pooldoc has posted at the top of this forum. Let me know if there is anything you don't understand. You should have put the algaecide in the water before you started the stain treatment. After you let the ascorbic acid recirculate in the pool for at least a 1/2 hour, and you see that all of the stains are gone, then you should have added enough sequestering agent as the bottle suggests for the amount of water in your pool. Until you have done that, the stain will just come back. Once all of the stain is gone and the sequestering agent is in, then you can start to bring up ph and then add chlorine in to get it to the bottom end of the best guess chart, and continue that process until your chlorine starts to hold in the pool, which means all of the ascorbic acid is removed. If you see stains start to come back you drop the ph back to 7.0 - 7,2 and add more sequestering agent. If you don't follow these steps you will be in a vicious cycle of stain battles.
Bookmarks