5 gallon buckets is how I did it! Lowes buckets with lids.
I had a 50 barrel and would run 7 buckets (35 gls) and fill up the 50 and add salt and a Mag 7 to circulate. I would then make another 7 bucket run. Test the 50gl salinity and add to the my tank (110 gl with 40 gl sump). Continue until all filled up! LOL
Bob
I have a 55 gallon barrel, 5 five gallon jugs, rodi water and a brand new bucket of red sea coral pro salt. I can deliver and we can mix in my 20 gallon can for $125