Ive been using their 4.4 gallon jugs to do water changes on my 55gal mixed tank for the last month or two. Seems to be good stuff and saves me time with mixing and R/0. Ive heard about some other guys not using it because of the cost, but my lfs sells this stuff for about $14 and thats the cheapest ive seen it anywhere. The only issue ive had so far is the salinity seems to be a bit high, around 1.028 but everything else seems to be on par. My fish and coral seem to love it. Anyone else have experience using it?