Quickly change water just use a long hose and 2 flow valves, you can change the fish tank water more quicker and easier, no need electric, it's semi-automatic water changer suitable for medium and large fish tanks.
Easy to install It's very easy to use, firstly connect the hose ends to the 2 connectors,then attach one connector to faucet, the other connector to the gravel tube, then you turn on the tap, then turn on or off the controls valves on the 2 connectors.
Gravel cleaning with the pressure from the atmosphere, the gravels and sands can be sucked up to the gravel tube then to vacuum out the debris in gravel.
3 sizes available choose the size according to the distance from your fish tank to the nearest faucet, hose length: 25ft, 33ft, 49ft.
With control valves The water changer comes with 2 built-in on/off flow control valves,to turn it on or off you just need to rotate the valve by 1/4 turn up or down.