Hi Debbie,

First, dont worry, I feel confident that you will be able to get rid of the stains. Here is what I would do:
First your ph is way too high for a fiberglass pool. You should run a fiberglass pool's ph on the low side - not higher than 7.4. I like to run mine from 7.2 - 7.4. Next, your alkalinity is too high - it should be no higher than 120. I like to keep mine around 90 - not higher.

You will need muriatic acid to bring your ph down to 7.0 to 7.2. Then turn your return jets facing up so that the water bubbles on the surface. This will lower your alkalinity while raising your ph. When your ph goes above 7.4 add muriatic acid again to take it back to 7.0 and repeat the process untill you reach the alkalinity you want - I would shoot for 80. You can find this process in the Alkalinity forum. Then let turn your jets back down when your ph hits 7.2. Add a sequestering agent - Anything that says it will bind with metals - like Metal Free, Sequasol, or there is a product by Proteam called Metal Magic, but I haven't tried it yet. Put enough in according to the directions on the bottle. More is better than not enough. Keep the pump on 24/7, and let it go for about 2 days. See if the stains lighten. If the stains don't lighten up after this, then you can do an ascorbic acid treatment. You can get it in bulk from these two websites. Most stain treatments are just ascorbic acid:

http://www.msm-msm.com/store/agora.c...scorbic%20Acid

http://www.chemistrystore.com/Ascorbic_Acid.htm

Let me know how the first process goes, and if you need the ascorbic acid I will tell you how to use it. You can also get a really fine sand paper and use iit on the rust stains. I have used this in my fiberglass pool and it take the stains of easily - it is only good on rust stains from nails or hairpins, not when you have a really big area.

One of the reasons you get stains in a fiberglass pool is by running an alkaline pool. Fiberglass tends to stain and plate when the water alkaline water combines with high chlorine levels. With an indoor pool you don't need any cya, therefore a chlorine of 5 is high, which with the high ph level will let any metals that are in the water fall out and stain the pool.

Hope this helps, feel free to ask any other questions you may have.