DeanP66
0
Looks good. Next you can try to solve those stains. They may be iron stains. Test a small area by crushing some vitamin c tablets inside a sock and rubbing it against the stain for a few minutes. If it's iron, it will lighten after a couple of minutes. Once you know it's iron, you could try an ascorbic acid (AA) treatment on the entire pool. You basically:
1) Adjust pH down to 7.2 and let the FC drop near 0 (can be a bit risky if the weather is warm(algae)
2) add your AA around the entire pool. It's basically crushed vitamin c in a powder form. You can use as little as a couple of pounds or even up to 4 or 5. I did a treatment on my pool (20,000 gallons) last August and I used around 6 pounds. I started it with my FC at 2. I couldn't wait any longer. The AA will just burn off the remaining FC before actually going to work on the stains, so you need more of it in that case.
3) Add 2 bottles of metal sequestrant to keep the stains in solution so they don't end up back on the walls and floor of the pool. I use the Metal Magic brand.
4) Start adding FC back to the pool slowly. I added enough to get to my lower limit (FC 4) and checked it often cause the chlorine will eat the remaining AA in the pool and get used up very quickly. So redose it often back to at least 4. Eventually it will start holding, but you'll use quite a bit of chlorine until that happens. Once it starts holding, adjust the FC up to its normal level. You don't want to shock the pool for at least a couple of weeks cause that could cause the stains to come out of solution and go back onto the pool's surface. Hopefully, you don't have to shock at all.
5) Then, you simply add a maintenance dose of sequesterant once a month to keep the stains in solution and off your surface. I use half a bottle a month (16 oz) and the pool still looks great.
1) Adjust pH down to 7.2 and let the FC drop near 0 (can be a bit risky if the weather is warm(algae)
2) add your AA around the entire pool. It's basically crushed vitamin c in a powder form. You can use as little as a couple of pounds or even up to 4 or 5. I did a treatment on my pool (20,000 gallons) last August and I used around 6 pounds. I started it with my FC at 2. I couldn't wait any longer. The AA will just burn off the remaining FC before actually going to work on the stains, so you need more of it in that case.
3) Add 2 bottles of metal sequestrant to keep the stains in solution so they don't end up back on the walls and floor of the pool. I use the Metal Magic brand.
4) Start adding FC back to the pool slowly. I added enough to get to my lower limit (FC 4) and checked it often cause the chlorine will eat the remaining AA in the pool and get used up very quickly. So redose it often back to at least 4. Eventually it will start holding, but you'll use quite a bit of chlorine until that happens. Once it starts holding, adjust the FC up to its normal level. You don't want to shock the pool for at least a couple of weeks cause that could cause the stains to come out of solution and go back onto the pool's surface. Hopefully, you don't have to shock at all.
5) Then, you simply add a maintenance dose of sequesterant once a month to keep the stains in solution and off your surface. I use half a bottle a month (16 oz) and the pool still looks great.
