I'm in Ontario, so we'll be closing in the next week or so. I've had the heater off for a couple weeks and the water is about 60. I had also turned off the SWG as well and it had been off for a week or so. The solar blanked has been on this whole time as well. In any case, I flicked it on for a couple hours yesterday (the SWG) and today I tested the chlorine level as I'm not too sure at which temperature I no longer need to worry about algae. Anyhow, it's usually a mid to dark yellow, and today it almost look red. Any ideas?