Oxygen consumption is greatest near the bottom of a tank, where sunken organic matter accumulates and decomposes.
This anaerobic water is where you normally draw your water from.
A floating water pickup in your tank will take the water from just below the surface where the water is more oxygenated and the freshest. This water also contains less sediment that can prematurely shorten the life of you filters and pump.
This floating pickup has a non return valve. This valve is situated by the float and stops the water in the suction hose from flowing back into the tank.
Comes complete with 2.5 meters of 32mm flexible hose, float, Nylon gauze filter, non return valve and 32 mm male straight coupling.