algaecide

[vinper]

culator has not change to any color , does not seem to have absorbed any metals running it 2hrs a day for last 2 weeks

[chem geek]

It doesn't always change visibly on the outside. If you have a metal test kit you can see it the concentration in the water has dropped. Eventually, you can take the CuLator out to replace with another and can open up the old one to see if anything is visible. Or contact the company to see what they think.

[vinper]

well the water no longer turn green when i shock it . culator did not change color but i assume it worked

[chem geek]

Thanks for the update. I'd call that a possible success since we don't know for sure that it was the CuLator that helped or whether something else over time did the trick such as water dilution or perhaps precipitation of the metal somewhere.