How To Build A Koi Pond Filter. Naturally, koi is an aggressive breed. Drill a larger hole in the lid of the bucket to insert the hose of the pump.
If you build it right, this should be last time you should ever need a koi pond filter. This article will explain in detail exactly how i built and designed my own pond bog and accompanying filter. This filter uses the 1.5″ (40mm) pipe work, but can be changed to the 2″ (50mm) pipe if required.
If you want a raised bog (80% of the bogs we build are raised) build the retaining walls for the bog area out of a combination of full sized cinder blocks (8x8x16” and 4” cinder blocks (4x8x16”) mortared together, making a 12” deep pit for the filter.
Connections between several filter chambers and drain into the pond; Build the frame (as shown) using plenty of the adhesive. Look for an area with either part sun or full sun if you are planning to keep fish and/or plants. As mentioned the depth is very important but so is the contour of the pond.