Ascorbic acid treatment for stains, which sequestering agent to use?

[PoolDoc]

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Amazon
Many of these chemicals will be available locally . . . but the problem is, you probably won't be able to tell. Pool chemical companies put a lot of effort into hiding what's actually in their products. I had to work pretty hard to make SURE that these chemicals were what we needed. I've tried to indicate the products that you may find -- and identify correctly -- locally. However, if you can find the Kem-Tek brand locally, and find IDENTICAL products, they should be the same locally as on Amazon.

1. Kem-Tek 60% polyquat => $18
0.7 ppm per fluid oz; 4 ppm dose = ~ 1 cup liquid measure.
Polyquat is available locally, but this is a pretty good price.

2. KemTek 20% HEDP "Metal & Calcium Eliminator " => $14 (but, get 2 bottles = $28)
0.2 ppm per fluid oz; 2 ppm dose = 1.5 cups fluid measure
It's very difficult to identify the concentration of HEDP products.

3. Photographers' Formulary Sodium Thiosulfate, 1lb => $7
1/3 lb should remove 5 ppm of chlorine from your pool.

4. Ascorbic acid => $17 (but, get 2 pounds = $34)

5. CuLator, 1.5 ppm => $40 (does NOT ship from Amazon)
CuLator, 5 ppm => $70 (does NOT ship from Amazon)
Your choice on which one to buy. If they work as advertised, the smaller one should be sufficient.

6. In the Swim 24 x 1# Cal Hypo => $64 ($2.67/lb) (does NOT ship from Amazon)

Optional:
7. Iron Out, 30 oz => $10, delivered. Does NOT ship from Amazon. Small bottles are probably available locally.


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Local:

8. (5) boxes of 20 Mule Team Borax => Walmart

9. (2) gallons of muriatic acid => Lowes, Home Depot, Ace Hardware

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Testkits

You will need either the K2006 (preferred) or the K1000 for this process. If you don't have either, check this page:
How-to-Get-the-Right-Testkits-for-your-Pool
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PF => 16