I used to use only NSW and made a PVC frame to hold jugs in the trunk of my Corolla. Then I started testing it and comparing it with other people. The old Steinhart Aquarium's 10 cents/gal NSW originated at a pipe just off the coast and delivered NOT good water at times. The other main supplier at the time was Catalina, but it fell into bad water times, too, for awhile. This time around I am using salt mix and it is easy to make since I have to make RO anyway. Except of course when I had filter trouble, then I was panicking. At school I have a ton of space; at home it would be a different story because I do not have a garage.