I've started mixing in a trash can by running a power head for about 30 mins then covering with its lid. I dose from this with a dosing pump and it lasts about three weeks. Would it be beneficial to periodically run the power head to remix? I worry about settling from not mixing vs increased precipitation from more mixing. Some have suggested it's best not to disturb the scum which forms on the surface. I've even thought of floating a circular piece of styrofoam on the surface to minimize contact with air. If cut to a slightly smaller diameter than the trash can it could move with the water level.I would not worry too much about air getting in from a short mixing time. There’s no need to froth it, but stirring for 15 min will be fine.id cover whatever you store it in, but a trash can like lid is adequate.