sweeTang21;1654243; said:the easiest way i found IMO on tanks larger then 200 gallons is to get a cattle trough's and run your RO water line right to it, or other source of water. I would also recommend getting some powerheads in there to keep the water circulating so the salt dissolves fully.
My rule of thumb is having at least a 50% water change of water on hand for any "disasters" that may happen.