Has anyone here tried using a water set-up that consists of a submersible pump-fed filter system, for the espresso machine? This is what I'm thinking of:

1. Submersible pump in a water tank / bucket
2. Feeds towards a water filter system
3. Which goes out into another tank / bottle, where the espresso machine draws water

I'm not experienced with submersible pumps. Do these things have a mechanical system where they switch on when there is a draw of water? Say for example, if the submersible pump feeds towards a faucet, and the opening and closing of the faucet is what actuates the pump.