I have a 45 gal rubbermaid trash can I have been mixing in for years. I almost always add salt to water, then if I need to dilute a bit I add more water. I keep a heater and powerhead in there and by the next day it self-mixes (no salt left on the bottom save a bit of white precip). My can has always had white precip forming in it, but not a whole lot. I always add CA to my system anyway so does it really matter or is this a minor detail?