Love it. It just leaves residue in the mixing bucket. Parameters are pretty damn close to where I want to keep my tank 8.5 alk 450 Cal 1400 Mg. My best advice I can give you is choose a salt with parameters closest to what you planning on running your tank at. It pays off in the long run. You dont want to have a 7.5 dkh tank that your doing Water Changes on with 12 dkh salt. No faster way to cause your corals to turn on you.