We had some staining on our approx. 11, 300 gallon fiberglass pool. I used the vit C to check and sure enough it cleared up the areas I dropped the tablets very well. So, some sort of metal staining was taking place. This is our second year with the pool. We didn't have staining last year but this year it seems to have progressed over the course of the summer. Fall, winter and spring it was fine.
So, try as I might, I do not understand pool chemistry very well but we test with a TF100 test kit and try to keep things balanced. I'll include last nights numbers.
Didn't test for CYA or CH.
Our pool has a SWG- however, we have no idea how to tell what salt rate we have so we guess. I know... Trust me, we have tried to figure this out, it came with very little instruction(from the PB) and it seems even less is available online. We bump it up or down depending on if it seems too salty. I think it is currently set to 20% because the water seemed too salty recently and we dropped it down a bit.
Anyway, at about midnight, I added a bottle of Pool Time, Metal, Stain and Scale Out from Home Depot. I don't have time to wait to order online and need this pool straightened out fast!! I didn't brush the walls or anything. The additive is some sort of PHOSPHONIC ACID, I believe. While it appears that the staining is lighter, it is still there- albeit very faintly. I'm considering adding a second bottle today while my chlorine is still on the lowish side to see if I can kick it completely. Advice? It says not to add more than 3 bottles and after seeing what one can do, I think a second may complete the stain removal, however is there something else I need to add after it appears clear? Do I hose out my filter? It seems to be running high, there is more pressure showing on the gauge. My ph was not low enough but I added the metal remover stuff because I'm short on time and trying to do this alone. I need to get this pool "healthy" again as quickly as possible. I'll have to leave it unattended while traveling and don't want to come home to an out of control science project. I also have four anxious kids who want to swim. At what point do I dare allow them back into the pool?
Thank you so much!!