setup:
gravity is your friend. the reservoirs have a drain line, one goes to your sump, the other down the drain (or directly to the plumbing). The key is to have the reservoirs higher than where they are going. In the case of both system i put this on I had to cross over a room, for this i mounted the respective reservoir onto a ceiling joist so that it could drain to the other side of the room - to do this you need a larger pump than the standard pump with the unit. If you decide to try this (over the ceiling) yourself you will need to order an extension for the wire going to the reservoir.
here is a picture (straight from the genesis site):
templates:
When i first set this up on my tank I had both reservoirs mounted to a wooden backer which I anchored to the concrete wall. excuse the power strip, I was eager to get things running and didn't have time to run electric. The reservoir shown is the pre-mix with a float switch letting the renew system know if there is water left. notice the 1/2" PVC allowing the float switch to go where it needs to be:
A while later I moved the drain reservoir into the ceiling (thank the original builder for the wiring mess up there):
The pre-mix had a powerhead added along with a pump allowing me to direct transfer pre-mix into the sump for when i siphon clean the sand bed. There is a also a heater which I only use when I'm refilling after siphoning the sand bed. The large tube going in is how I transfer from the mixing reservoir on the opposite side of the room into the premix holding reservoir. The tube going across is the ATO. This is the messiest part of my system, partly because I had nowhere to fit it other than in-between the water heater and furnace and there is a just a lot going on there.
Here is the sump with the float switches on the genesis brackets. the Renew with is towards the back, the front is the future home of a safety that shuts the return pump down for 5 minutes if the water level is too low.
My experience has been great. I attribute part of my reefing success to making water changes easy.
happy reefing!