Bottom Drains
Pond Bottom drains are generally accepted as a must and should be fitted to all Koi ponds under construction. Bottom drains are designed to be placed at the deepest part of the pond for the removal of the wastes and the settlements of the koi.

The vast majority of solids will sink to the bottom of the pond in time, where ideally, they will be sucked into the bottom drain and fed to the filter systems where they will be either extracted from the water. Bottom drains count for the vast majority of the water circulation.

Bottom drains - or the pipe work from the drain to the settlement chamber should not be too long. This is because although there is water flow through the pipe work, the heavier solids tend to settle out and can build up in the pipe work itself.