I recently switched from using fresh water evaporation replacement to Kalk
for evap replacement. (That's worked quite well BTW
I left the fresh water replenishment tank beside the sump as it was still useful from time to time to turn on the old replenishment system.
Anyway...I noticed the other day that we seemed to have a lot of mosquitoes in the house lately. Sure enough, I had mosquitoes breeding in my old fresh water tank. I can't imagine what they were living on....it's pure RO
water, in the dark. There isn't even any algae in there.
Nothing much to do with this particular discussion, but all the talk of keeping water sitting around reminded me.