Reef crystals, seems to be very consistent on elements and as torx said, Boxing Day sales, enough salt to last you a year, at probably 2/3 the price.....
I was using the IO that my buddy gave me with the tank. On Boxing Day I picked up some Kent Marine as there was a sale. I've been mixing the two trying to use up the IO and figured it would also help acclimatize everything to the new salt. By the time summer hits I should be strictly on the Kent Marine.
I used h2o for a bit, and really didn't notice any difference at all. Now I just buy the 200g boxes, and it's 1 bag for 50g. I use a calcium reactor anyway, so I'm covered as far as dosing.
Using aquavitro. Was using IO.
Finding with mixing I'm getting as good a deal with the vitro taking less to get to 1.026.
Not accounting for sale prices though.