Submersible Water Pumps

R 110.00R 470.00



Submersible Water Pumps are used to circulate nutrient-rich water in NFT and other hydroponic systems.

Choosing the right water pump will be determined by how high the pump would need to lift the water. ( In the table below the listed Head Height is the height where the pump basically stops pumping any water. ) The prescribed flow rate for NFT hydroponics per channel is between 1 and 2 liters of water per minute. Choosing a pump slightly larger than the one that meets your minimum requirements is advised, as the flow rate can then be throttled back slightly by using an inline tap.

Model Output Head Pipe Fitting Size Power Consumption
Grech HJ-542 400 L/h 0.8m 12mm 5w
Grech HJ-742 600 L/h 1m 12mm 8w
Grech HJ-942 800 L/h 1.3m 12mm 16w
Grech HJ-1142 1000L/h 1.6m 15mm 22w
Grech HJ-1542 1400L/h 2.0m 20mm (Needs hose clamp) 28w
Grech HJ-1842 1800 L/h 2.5m 20mm (Needs hose clamp) 40w

Submersible water¬†pumps are just electromagnets. The coil is in the main body, and the impeller shaft has a magnet. Water can get in-between the impeller shaft and main body, and it acts like a lubricant. There are just a few basic parts, the main body, the impeller and shaft, the flow restrictor, impeller cover, and inlet opening cover. It can be taken all apart and cleaned. You should get used cleaning the pump regularly.¬†It’s easy to do especially when you do it regularly. Just take it apart and use regular dish soap and a sponge or brush.

The Grech pumps come with a filter sponge and need to be cleaned regularly. All you need to do is put a dab of soap on it and work it in under running water, then rinse it out thoroughly.