I know that stains have been discussed before, but I was still thinking it might be helpful to get some input. I just opened my fiberglass pool last week. Once the water began to clear I noticed discoloration and stains. There are streaks in the pool, that to me looks like the original color. I have attached a picture that show a V-shaped streak (scroll down to see the V) that I believe is the "cleaner" color. That means the rest of the pool is discolored. I did the puck test and there was no change. Also brushing does not seem to help. I've been slamming the pool for several days. It's not quite there yet since I am getting a combined chlorine of 1.5, but the water is relatively clear and the chlorine only dropped a couple of ppm overnight.
Here are my questions:
1. When I do the ascorbic acid test, do I need to get into the water or can I put the sock on the net somehow to hold it on the surface.
2. The pool has stones around it. Some of the cement between the stones was redone last year. This year when I opened the pool I noticed the cement that was used is cracked and in some cases was mushy. Some of it went into to pool. Could that be what has caused the discoloration?
3. Any other thoughts on possibilities:
1. CYA - is low at around 20; I know it needs to go higher but I don't think it is relevant to the staining. I've been adding trichlor tablets to increase it but may need to add CYA directly.
2. FC - been keeping around 12 or more
3. Alkalinity - was at 40 but increased now to 80
4. PH- About 7.5
5 CH- tested today at around 175.
Here are my questions:
1. When I do the ascorbic acid test, do I need to get into the water or can I put the sock on the net somehow to hold it on the surface.
2. The pool has stones around it. Some of the cement between the stones was redone last year. This year when I opened the pool I noticed the cement that was used is cracked and in some cases was mushy. Some of it went into to pool. Could that be what has caused the discoloration?
3. Any other thoughts on possibilities:
1. CYA - is low at around 20; I know it needs to go higher but I don't think it is relevant to the staining. I've been adding trichlor tablets to increase it but may need to add CYA directly.
2. FC - been keeping around 12 or more
3. Alkalinity - was at 40 but increased now to 80
4. PH- About 7.5
5 CH- tested today at around 175.