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Bottom Drains for Your Koi Pond#020
April 26, 2010
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Koi Pond Bottom Drains

Welcome to the 29 new Subscribers.
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Hi

Should you install a Bottom Drain in your pond?

Yes and hereís why.

Bottom drain filtration is probably the most underestimated of filtration and pond cleaning systems. Remember that your pond is the biggest settlement chamber you have and a considerable amount of debris will collect on the bottom, including leaves from surrounding trees, dust, fish waste, and uneaten food from within the system.

Bottom drains take the heavier, dead water and debris from the bottom of the pond to a separate chamber, where it is either passed through the filtration system or discharged into the main drainage system.

Recirculating bottom water through the filter is only recommended when the stocking level of the pond is low and you want the nitrifying bacteria in the filter system to obtain as much food nitrogenous wastes, as possible. When stocking levels are high, the water should be released through a valve or standpipe to a drainage system.

To be really effective, it is essential to scallop the bottom of the pond and position the drains in the center of these dished areas, which help to guide dirt and debris into the drains. Many people make the mistake of installing bottom drains on a flat surface, or even install the drain above the lowest point in the pond.


If you do not install bottom drains, or have not installed enough to cope adequately with your pond, you will need to vacuum the bottom of the pond regularly to avoid build-up of waste, using either a hand vacuum or electric pump with vacuum attachments. You will also need to make regular water changes, in practice, a daunting and very time consuming task. It is more economical to incorporate a bottom drain when building your pond, not to mention the aspects of easier clean up and having clear water with healthy fish.


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External Pumps


External pumps are generally more efficient than submersible pumps and use less electricity for the water volume pumped. They do require more plumbing and the installation of a leaf trap on the pumpís inlet for protection against debris.


External pumps designed for ponds look like pool pumps, but their internal design is quite different. Be careful not to confuse the two. A common mistake is to use an external pump in a direct-suction installation from a bottom drain without prefiltration. Direct suction is the use of a pump to pull directly from a pond with no prefiltration device to protect it. This causes a high schedule of maintenance with constant cleaning of the leaf trap basket.

Direct suction prefilters can be used when design and installation donít permit other types of gravity flow prefiltration. With them, properly prefiltered water can be sent to bio-filtration.






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, we would love to hear your comments and questions are welcomed and appreciated! Also, if you have any photos you would like to share of your pond, fish or plants we would love to see them, so send them in.

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