Used this for my lanthinum treatment. I came home from work and added my usual dose of top off water and saw this empty bag and inspiration struck. I love my tank so much I don't like the idear of spending less time with it. Thats the reason i havent bothered with ato. But seeing stability is everything I figured this would cut way down on the salinity going up cause evap. If it works out I'll probably install the line on resivoir for simple no moving parts top off.