I use the powerhead shown down below to keep it mixed. I also have a heater and a small filter to minimize hair etc that gets in the Brute. I use a rechargeable pump to get the water to my display tank because it's about 12 feet upIf you are just going to make salt in it, any powerhead will work.
Acquaer Battery Powered Water Pump 1/6HP 18V Cordless Submersible Utility Water Pump with 3/4"Garden Hose Adapter Ebay has it for about $70 open box. It's about $129 on Amazon. Home Depot has it for right at $100.
I have been using it for about 3 months with no problems.Also with the brute there are some videos on youtube to show best how to use a brute including; drilling a hole for your wires (pump etc.) I have mine connected to my R.O. system) You can find plenty of videos showing you how to set this up using a float system to fill and shut off automatically. (It's fairly cheap) and saves a lot of time having to pour the water from the R.O.