You may have already removed the metals. Depending on how you shocked to remove the ascorbic acid, you very easily could have put the metals on the filter, and then backwashed them away.
This happens very regularly -- the problem is that we don't have a good enough handle on it to make it predictable EXCEPT with cal hypo dosed via the skimmer, which is potentially dangerous.
The bottom line is, you can only be sure that the CuLater is NOT working, if you are FIRST sure there are still metals in the water.
Don't throw the CuLater away. If nothing else, test it!
Put it in a plastic container with a couple of copper pennies, a gallon of water, and a cup of vinegar. Over a several day periood, it should pick up copper dissolved by the vinegar, changing color as it does. If you see it change color, remove the pennies as soon as you see the color change, and then leave the CuLater for a week, shaking or stirring occasionally. It should remove any remaining copper. Take out the Culater and add baking soda till the fizzing stops. Then add another 1/2 cup and mix till dissolved. Allow it to stand overnight. IF there's still copper in the water, you should have some colored precipitate. If NOT, the CuLater did work, at least after a fashion.
Alternatively: get a skimmer sock, and just leave the Culater in the skimmer UNDER the sock (so it doesn't get fouled).Poolmaster 16242 Poolmaster Skimmer Basket LinerIf you have any continuing metal addition to the pool, you should see a color change.
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