previously installed late July (29), very simple as of today 16 August works as advertised. I will wait another 30 days to see how it works. Sulfates appear to have decreased on the top of the cups. Maybe it works top down. You know, I've recently noticed that I'm not keeping the water lever at the right level in the batteries. Adding only a small amount of water, according to the battery manufacturer, makes the device work better. It's a learning curve. Everything seems to be perfectly inβ¦