Help with stain removal and metal free

[webfeet]

I've been ill and the pool has been neglected. I have had a solar cover on it about a month. I kept the pump on low or off most of the time- to aid raising the temperature. The temp is 87 and its wonderful, but the stains are back worse than before. The white parts of the pool-steps, returns, drain, etc. are rusty colored. Should I have been adding a routine dose of sequestering agent? Do I just start all over with the treatment to remove it? If I put in ascorbic acid without a sequestering agent, won't the stains come right back again? I thought they were metal stains, but could they be something else? Thanks for your help again.
Ph 7.0
FC 2.
CC.0
cya 10 (?)

[mbar]

I hope you are feeling better You can try adding a sequestering agent first with your ph at 7 - no higher. This may lighten the stains. Your chlorine is too low, and I don't know how you are keeping chlorine in on a sunny day with a cya of 10- are you sure of these numbers? The metal out (sequestering agent) along with the low ph may lift the stains off. I wouldn't do the stain treatment again until you add the metal out and keep the pump running for a few days to see if the stain start to lighten up. If they don't - then the ascorbic acid treatment will be needed again. You always have to make sure you use a metal out (sequestering agent) when you do the stain treatment. If you don't the stains will come back as soon as you shock and have a ph over 7.5. If you have a lot of metals in your fill water, then you have to add sequestering agent on a regular basis. Feel free to ask any other questions you may have.