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Water Pumps

Water pumps for drainage, transfer, and washdown. This range covers submersible and surface-mounted models, from low-level automatic pumps for flood basins to dirty-water units that handle grit and debris. Pick submersible if the pump sits in the sump; surface-mounted if you're drawing from a tank or rainwater butt. Check flow rate against your outlet size and vertical lift—a 250 L/min pump pushing through 10 m of head will deliver far less at the tap.

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Submersible pumps sit in the water and switch on via a float. Low-level models (rated down to 2 mm) empty shallow puddles in basements or plant rooms; standard floats stop around 30–40 mm. Dirty-water pumps pass solids up to 30–35 mm—soil, leaves, gravel—without clogging the impeller. Use them for construction pits, farm effluent sumps, or blocked drains. Clean-water automatics suit rainwater harvesting, irrigation tanks, or any source free of grit.

Surface-mounted pumps stay dry above the waterline and pull through suction hose. They prime faster and you can service the motor without fishing it out of a tank, but maximum suction lift is about 7–8 metres and you lose flow quickly with height or undersized hose. Fit an inlet filter to catch debris before the impeller. Use solid-wall suction hose, not collapsible—vacuum will flatten it. Match hose diameter to the pump inlet; a 25 mm hose on a 1-inch (25.4 mm) BSP fitting works, but check the thread type if you're connecting to existing pipework.

Flow ratings assume zero head. Add 10 metres of vertical pipe or 50 metres of horizontal run and you may halve the output. If the job needs a specific delivery rate at height—filling a header tank, for example—work backwards from the pump curve or oversize the motor. Sealey pumps in this range run on 230 V mains with thermal-overload protection; the automatic models use a tethered float, so leave enough cable swing in the sump for the switch to trip cleanly.