Hi Fellow planters Here is a pic of a unit I made for a customer for automating water changes. This is a normal washing machine 220v solenoid that can be connected to pumps or water supply. one can connect a float switch which controls this unit which will automatically fill your aquarium. The unit needs modification, if you have friends in the engineering side like I do, they can machine parts that can be mounted inside a box an adapt the exit to accommodate a pipe. Just another crazy idea, i had, i enjoy making gadgets.