Bob A wrote:

I have to use an RO unit due to well-water toxins, and I store it in a large
(never used) garbage can. Keeps enough for a 15-20g change in a 55g tank.
(The water at the bottom is difficult to get out.)

bob

A water pump meant for a water fountain works great. Just leave it in the bottom
of the can. I use mine to mix the minerals while in the can, and to pump water
down the long hose from the closet to the tanks. Drop a heater in the can and
you have a complete water treatment system.