Metal in the water (Fiberglass 35K pool)

[blk133]

Can someone please tell me how much of Ascorbic Acid do I need to put in a 35K fiberglass pool?

The metal stain is all over the walls and floor.
I tried 5 foam cups around the pool but it seems not enough. Acid desolves very quickly and I started to see white streaks on the wall but overall the pool is still not white.

I have a DE filter EC-75 and it doesn't have a circulate option. It is always filtering. Is it ok? Or should I turn it off while I am doing it?

Thanks,
B.

[mbar]

You will need about 3 or 4 lbs. I use anywhere from 1 to 2 in 16,500 gal. It is ok to turn the pump off and walk around the pool, dropping the ascorbic acid down the sides of the pool. Once it is all dissolved, you can put your pump back on and let it filter. Let it filter 24/7. I would start with 3 lbs, and then if all the stain isn't gone in 1 hour walk around and put the other pound in where you still see the stain. Keep me informed, and feel free to ask any questions you have.

[blk133]

I used about 3.5-4 lbs of Ascorbic Powder, can't say exactly, but I still have about 20% left in the bag.
2 hours later I droped 4 bottles of Sequasol.

I can still see stains in some places they are very lite, but mostly it's looking good.

Do you think it is ok to add more of Ascorbic Acid even though I already added a Sequasol?

When I am adding Ascorbic Acid it looks like it disolves before even reaching the bottom of the pool.

My Chlorine level is 0

Thanks,
B

[mbar]

It does dissolve before reaching the bottom. It is fine to add sequasol right after the ascorbic acid - and not a problem to add the ascorbic acid after. I would wait a while befor adding more, I think after the water filters for a while it will take the rest of the stain off. You can add more ascorbic acid, but it will just take longer for the pool to hold chlorine. The pool won't hold chlorine till the chlorine eats up all the ascorbic acid that is in the water, that's why I try to use as little as possible. You can even wait till tomorrow to add more if you still have stain. Congrats! you're almost finished!

[blk133]

24 hours later. I have not been home yet, but my father called me and said that water is not as clear as it used to be (foggy?)

Why would it be foggy? Because Chlorine 0? Algae bloom?

How much chlorine can I put in? I know that I have to add it in small amounts, but how small? 1 bottle 3/4 Gal? 2 bottles?

Should I add some Borax? I don't know how much my PH is at this time.

Thanks,
B

[mbar]

The water is cloudy from the metals going back into solution and the sequesterant - it will clear up, don't worry. I would not start chlroine until tomorrow. Then add enough to get you to 1 to 2ppms. You will need a lot of borax, because the ascorbic acid will take your ph way down. Check it, put in a half a box and test 2 hours later. Keep doing that until you get to 7.2. Don't bring your ph higher than 7.2 for now. Keep your filter running 24/7. Test your alkalinity - if it is low you can use baking soda as well.

[blk133]

Checked the water today, it is about 40 hours after Ascorbic Acid was added.

Very cloudy (like milk) Bumped the pump, because pressure was at 35.

Chlorine 0
Ph 7.2 (for some reason it didn't go down as much as I thought it would)
It was at 7.5 when I started adding the Ascorbic Acid

Didn't add any Chlorine yet.