This is our water change system. First we fill this 40gl bucket with RO/DI water, then with the Magnum 350 canister filter we can:

1. Polish filter the water bucket water

2. Polish filter the tank water

3. Pull water from the tank and drain outside the house

4. Pull water from the bucket into the tank

With this system we can do a 30gl water change in about 15 min. without spilling a drop of water.