65g Reservoir

I plumbed a 65g barrel into my system to help cut down on the bio load. I completely covered it with insulation since it is out in the garage. This way the chiller does not have to work overtime keeping up. It will also be completely sealed from the light.
I plumbed with 1" PVC and use a Mag24 pump. As you can see in the pics, I put 3 unions in place. One to disconnect the pump for cleaning and two to disconnect the barrel. I also installed a valve on the front of the barrel for water changes. I can isolate the barrel from the system with valves also. The plumbing into the barrel and out of the barrel are located high up so if power goes out it will only dump about 2 gallons into the sump.
I used high grade stainless screws for the top to seal down the plexi-glass cutout.
The pump and the return are located in the same area of the sump. That way it replaces the same amount of water it pumps out continuously and does not increase the water flow across the sump area.

Here is my water storage container. It holds up to 60 gallons of RO/DI water. It sits about 20 feet from the reservoir above.
For water changes up to 60 gallons, I isolate the reservoir from the system with the valves. Shut off the chiller, hook up a hose and drain it to the street.
After that, I run a short hose from the storage container (which has a Mag 5 in it) over to the reservoir and fill it up.
The water change is then complete and it is all done out in the garage.

You can see the RO/DI unit on the wall. The container has a Mag 5 in it so I
can just hit a switch to get water from it for top offs.

This is how they are located in the garage