Rain barrels also work good. I have two of them...one for fresh water and one for saltwater. I have a pump in the fresh water barrel that runs to the
sump and gets automatically switched on when the water level has dropped in the
sump. If you do this, just make sure that you drill a hole somewhere in the tubing so that you don't drain your entire fresh water barrel into your
sump!
This photo's kind of dark, but you can see how I have the two barrels under the counter. The saltwater barrel is on rollers so that it can be moved in and out for adding salt once it is filled. We also have a safety drain in both barrels that hooks into the sink plumbing, just in case we forget to leave the RODI running in the barrels!
