The links actually helped a lot, thanks. I don't know if the commission went through (I hope it did), because I had to go between many tabs when I ordered.

I tried the ascorbic acid treatment, but it didn't seem to lift the stains much.

How much I used:
60% Polyquat 1qt, NOW foods Ascorbic acid 3lbs, Kem-Tek HEDP ~1.2 quarts

Used both a vitamin C tablet and a trichlor tab to test. Only the vitamin C seemed to have stain lifted formations where I dropped it.

I switched to recirculate.
After using polyquat my FC level dropped to 0.4, and right now it is at 0.0, so it's not the chlorine either (?).
Alkalinity dropped to 110 after I used HEDP.

I made a mistake of putting in the HEDP before the stains went away (maybe about 10 minutes after ascorbic acid was put in), so that may be what I did wrong? I had to leave right after doing this, and came back much later to check and found the stains were still in the original places.

I used up the 3lb of ascorbic acid I bought, so I will have to wait for a new batch of ascorbic acid before I try again.


I have a question about the CuLator. I bought 2 1ppm CuLator. I noticed that there are 3 round balls in the packet.
I'm wondering how many of these "balls" are in the other CuLators. Maybe this can be used as a metric for how much product is given?


Took a look this morning, stains actually appear to look worse and are more widespread today.
I also notice some stains on the outside of the pool. It looks like I spilled something causing a greenish yellow stain. Could it be the polyquat or the HEDP?


(Edit by moderator: three posts in the queue were merged.)