DirectPumps & Tanks

This depends on where the tank sits relative to the point of use. If the tank is elevated above the outlets, gravity may provide enough pressure for basic uses like garden irrigation. For mains-pressure applications such as indoor plumbing, toilet flushing or pressurised garden systems, you'll need a pump to deliver adequate flow and pressure.

Pump selection comes down to two figures: flow rate (litres per minute) and head (the vertical lift plus pipe friction losses the pump must overcome). A rainwater harvesting system feeding a single toilet needs far less capacity than a whole-house or commercial setup. If you're unsure, tell us the number of outlets and the pipe run distance and we can help match a pump to the job.

Submersible pumps need enough clearance and depth to sit fully submerged without drawing in sediment from the base, so tank shape and outlet position matter. Most of our rainwater and sewage-rated tanks are designed with submersible pump chambers or sumps built in. Always check the pump's cable length and float switch clearance against the tank's internal dimensions before ordering.

A surface pump sits outside the tank, drawing water up through a suction pipe, and is easier to access for servicing but limited in suction lift (typically around 7-8 metres). A submersible pump sits inside the tank itself, pushing water rather than pulling it, which makes it more efficient for deeper tanks or longer vertical lifts. For most below-ground water tanks, submersible is the more reliable choice.

Yes — sewage and effluent pumps use a cutting or vortex impeller designed to pass solids without clogging, whereas clean water pumps will jam or fail quickly if used on wastewater. Make sure any pump fitted to a septic tank, holding tank or sewage treatment plant is specifically rated for foul water use. Using the wrong type is a common cause of premature pump failure and blocked systems.

Check float switches and non-return valves periodically to make sure they move freely, and inspect any inline filters or strainers for debris, especially on rainwater harvesting systems after heavy leaf-fall. Submersible pumps should be lifted out and checked annually for wear on seals and impellers. For sewage pumps, an annual service is sensible to catch early signs of clogging or motor strain before they cause a system failure.