Ok. I had to Google, to see what you were talking about -- I was referring to the possibility of STORING it over the winter that way.

OK. I just called Periodic, and was told that long term storage of the CuLator product in deionized water (essentially, the same as distilled water) should not result in any deterioration.

Let me be clear: the purpose of storing that way is to avoid it drying out and cracking (some polymers can do that, once hydrated -- I don't know if the CuLator product would do that or not) and to store it over the winter, or between use periods.

Putting it in tap water would result in it picking up whatever metal ions were present in the tap water, and thus 'consuming' a portion of the Culator's capacity.

However, the info from Periodic product suggests you'd be able to buy the 4 ppm CuLator pack, use it for a week whenever you added a potentially metal containing chemical or top-off water, then remove it, and store in in distilled water till you were ready to use it again.