So last night I did my weekly water change and switched out the ATO reservoir. I added a 2-1/2 tbsp of kalk+2 to the 5 gallon reservoir. Spectrapure UPLC II adds water for 4sec and off for 6 sec and turns on when the return chamber on my JBJ RL 45 drops about 1/4". This morning I woke up and when I went downstairs I smelt a burning smell coming from the tank. It is pretty distinct but not overpowering, though if you stop and try you can smell it in other areas of the house. I had my dad unplug my ATO and I will probably lose about 4-8 cups of water by the time I get home. Has anyone ever had this smell before? Will it go away or is my Kalk bad somehow? My ATO most likely would have only gone off once or twice last night at most since I did the change at 11PM. Thanks for any help.