Hailea 12V DC Air Pump

Use the duty point method: total the air your diffusers need, work out the pressure they need it at, then pick the model whose air flow at that pressure meets the demand – talk to us first here, because Hailea do not publish a curve for this range.

Allow about 10 kPa (100 mbar) for every metre of water above the diffuser, then add pipework friction and diffuser back pressure, which together commonly add another 5 to 15 kPa.

The 55, 100 and 140 L/min figures are the manufacturer’s rated output with no duty pressure stated, so treat them as a maximum and expect less air as diffuser depth increases.

Neither – these are 12 V DC units that run from a battery, solar setup or vehicle supply, which is what makes them suited to live transport and off-grid sites; use a mains blower or linear pump for a fixed installation.

Yes – an inlet air filter keeps dust and grit out of the piston and a pressure relief valve protects the pump if a line blocks or a valve is closed, and both are available from Fresh By Design.

The piston action is audible and the aluminium body gets warm in continuous duty, so mount the pump in a ventilated, shaded spot above the water line rather than inside a sealed box.

Yes – the same unit works as an air compressor or a vacuum pump depending on which port you connect to.