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Post new topic   Reply to topic    Irish Gardeners Forum Home -> Water features in Ireland, including all aspects of water gardening.

Which pump do I need?


 
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Rockworld
Rank attained: Hawthorn Tree
Rank attained: Hawthorn Tree


Joined: 27 Jul 2007
Posts: 54
Location: KILDARE

PostPosted: Sun Apr 11, 2010 1:06 pm    Post subject: Which pump do I need? Reply with quote

Sizing a pump for a water feature is important so that you not only achieve the look you require but also costs (purchase price and running costs and guarantee period).

Guarantee period vary from 1 year to 5 years depending upon model and manufacturer.

Costs also vary particularly regarding running costs. The flow rate of two different pumps may be the same but the running costs (electricity used, or watts) can vary significantly.

So in order to choose pump you need to know a few basic points, what will the pump be used for (eg a fountain display, a waterfall/stream, a feature rock, etc)

A few questions you should check are if a waterfall you need the know the height from top of water to top of waterfall and you need the width of the waterfall. (and if the waterfall is part of a stream you will also need to know lenght of stream).

If the pump is for a pond filtration system you need to know the volume of water in the pond, whether or not there will be fish in the pond. Different pumps give different flow rates at different heights so pump performance curves need to be checked.
For a fountain display you need to know how high the water will reach making sure it will all flow back to pond and not the surrounding area.

When you know the answers to the above its a matter of interpreting the pump manufactures specifications (which you should find on their website or contacting a supplier who should ask you those questions.

Knowing these few points will make choosing a pump much simpler. There is of course even further points to note but this will be a great starting point. Final tip is keep all measurements in metric as manufactures generally give all pump information in metric (eg distance in meters, flow rates litres per hour, volume in cubic metres)
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vulkan
Rank attained: Silver Birch Tree
Rank attained: Silver Birch Tree


Joined: 16 Nov 2009
Posts: 167

PostPosted: Mon Apr 12, 2010 7:37 pm    Post subject: Reply with quote

I agree with what rockworld says. Always check the pump you want to buy is capable of what you require it. Often with waterfalls people buy pumps that do not deliver the required volume and they end up with a dribble.

A reasonable waterfall requires around 50 GPH for every inch of width.
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