So here’s another thought… I wonder how long the shelf life of my pool shock solution is. I’ve had it a couple of years now. Was reading This thread and it made me think of it. Maybe I’m just not keeping my rez sterile. Wish you could buy bottles of distilled water smaller than a gallon. Might have to go buy a bottle just to be able to redo the solution. It’s not like it’s expensive, just don’t really have anywhere to put it.