I received my replacement cell today. Installed it - had to unplug the power from the controller to get it to reset, and now it appears to be working.

I ordered a 234s test kit last Sunday, hopefully I'll receive it soon and I'll retest all of the numbers.

Meanwhile, I've been testing ph and cl daily and adding bleach and acid as needed.

The water is still very clear. The sides and bottom still appear "dirty" any idea what this could be or how to clean it - I've tried brushing several times, no change.

Thanks again for all of the advice,
Kevin