I have ran R/C for my salt for years, but I had recently noticed that I seem to be getting a film on my circulation pump and the bigger problem is that the last box I received had low magnesium, with 0 tds RODI water at a .026 salinity I tested it at 800. So I thought this was a bad batch so I replaced it what the heck a new box and it tested out at 850. So that being the case I switch to RPM. I am very surprised at how fast and well it dissolves and even more important it test out at .026 9 dkh/1300-mag/400-CA which I can work with. The price is 44.95 for 205 gallon box witch is very close to the price of RC so that's nice. This is the first box I've tried out, but so far really happy, anybody else using this salt and what are your thoughts?