Guide written by:
Sebastian, self-taught DIY-er, Exeter
A surface pumpsucks up water at point A and pumps it out at point B. Point A may be a well, river, pool or garden pond and Point B a garden, hose, wastewater network, ditch, etc. A surface pump can also supply domestic appliances such as washing machines, dishwashers and toilets.For this pumping to take place, the surface pump creates suction via one or more turbines or impellers rotating at high speed.A surface pump, as the name suggests, remains on the surface of the water (unlike a submersible pump). Surface pumps can also be used as part of a hydrophore group - alongside a booster. Surface pumps are designed for water sources less than 8m deep, beyond which the submersiblepump takes over.The key characteristics of a surface pump are flow rate, pressure, discharge height and materials - principally of the pump body.
Before you get your strainer working, here are a few pointers and definitions to help you find your way around pressure, discharge height and flow rate!
If you're drawing water from a well, consider the suction depth and the type of water you're drawing. You'll also need to pay attention to discharge height, i.e. the height between your surface pump and the point where the water is distributed - if your garden is much higher up than the bottom of the well, for instance. If you have an automatic watering system, determine the exact flow you need, because the more watering points, the more water your system will consume!
If you're pumping water from a well or a water hole with your surface pump, be careful - thetype of water is a factor that shouldn't be neglected.Water pumped by a surface pump will fall into one of three categories:
If you're just looking to use your surface pump for watering from a rainwater collector, a "clear water" model will do just fine. Its granular passage (or granulometry) is very small (< 5mm) - so larger suspended particles will tend to clog and damage the pump body.
If you want to transport wastewater, choose a "loaded water" model. Granular passage is generally around 10-20mm.
For highly charged waters, you'll find specific surface pumps with a large granular passage (> 25mm). In addition, if you plan on pumpinghighly charged wastewater, you can get surface pumps equipped with a very large granular passage shredder. (Contribution by Jeremy, editor for ManoMano).
Tips for choosing your surface pump:
Decibel level can be a deciding factor, depending on the location of your pump - to remind you, the health warning threshold is set at 85dB.
To get down to basics and choose your surface pump wisely, you need to determine:
Consider your needs carefully at the outset, erring on the side of overestimation. If you're drawing well water from a depth of 7-8m, go for a submersiblepump: for one it'll be quieter because it's submerged; two, you'll get better performance. If you don't use your pump in the winter, consider draining and protecting it from frost. Bladdertanks don't always offer great resistance to corrosion, and anti-rust protection is easy to apply and inexpensive, so it's worth considering. Bladder tanks also need to be drained along with the whole system, so don't let yourself get caught out!
To find out more about household water installations, follow our editors' advice and check out their other guides:
How to choose your submersible pump?How to choose your rainwater collector?How to choose your watering programmer?How to choose your booster pump?How to choose your lifting station?How to choose your heat pump?How to choose your garden hose?How to choose your garden hose fittings?How to choose your manual pump?How to choose your watering controller and timer?How to control your water pressure?How to choose your water shut-off valve?
Guide written by:
Sebastian, self-taught DIY-er, Exeter, 235 guides
Redo a roof with wooden beams? Check.Advise Mister everybody in the DIY shop? Check.Redo the bathroom plumbing? Check.Fit together, build the walls, paint a partition, throw my hammer in a rage thinking that it will fix the problem? Check. The DIY motto ? Learning is better than delegating… well, it's also a question about your wallet! The satisfaction? The beer at the end of the job! What do the best have in common? The influence of Gyro Gearloose, Mac Gyver and Carol Smiley depending on your generation, a good dose of curiosity, a average hand-eye coordination and a taste for risks… and if it doesn't work, try again! Advise you? I'll do my best!