Quote Originally Posted by Cookieman View Post
No stains, but the cloudiness that began on Wednesday has gotten only slightly better - can barely see drain.
Quote Originally Posted by Cookieman View Post
Water is clear - cloudiness cleared up within 4 days or so.
Cookieman, can you tell me what triggered the cloudiness, or what event immediately preceded the cloudiness?

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Also, I'd overlooked your CH readings; 80 - 90 CH would NOT be a problem with HEDP.

Here's what I've begun to wonder. Is it possible that the stains have penetrated fairly deeply into your plaster, and that the AA is de-colorizing them, but that the souble mix is not actually being removed from the plaster?

If that's the case, you can test in two ways.

FIRST: take some chlorine and place it directly on an area where the stains recur, but that is presently clear of stains. If the stains are re-occurring from metal in the water, the physical presence of the chlorine will prevent that. But if the stains are from metal IN the plaster, the chlorine tab should pretty quickly cause those stains to re-appear. If you can get a cal hypo tab or bag of shock that would be preferable. Trichlor may be acidic enough to avoid re-forming the stain, in spite of the high chlorine level. Regardless of type of chlorine, do not leave it sitting on the plaster too long.

SECOND: if the problem is a soluble copper mix, you should be able to wash it out. If you can, while the chlorine is low, and the HEDP high, re-aim a return eyeball to direct a stream of water toward a location where the stains recur. After 24 hours or so, raise the chlorine level, and see if they re-appear.

Finally, if you are not already doing so, run your pump 24/7.