I have 3 Brute 44 Gallon barrels for producing RODI water and mixing with salt. I use a cheapo Marineland powerhead and a large bubbler stone/disc. Something cool I discovered with this setup is running the bubbler when the barrel is full produces a protein skimmer like effect that deposits any of the gray stuff on the lid. I use and love Instant Ocean salt, but there are times when batches seem to have varying amounts of it. Once mixed I drop a 500GPH pump in barrel and pump it through a whole house filter on it's way to the tank. I've been using this method long enough to see less junk in the filter due its removal "Skimming" in the barrel. I've also got to say the Brute barrels are so easy to clean and move that I regret buying water vessels that are too big, heavy, or hard to wipe out through a small lid. It's an eyeopener to see the solids that can be caught with fresh mixed salt.