Place the rubber collar over the liner and pipe.
Diy bottom drain for koi pond.
Install the bottom drain bulkhead fitting 1 below the pond bottom surface.
Place a bead of silicone around the pipe s outer perimeter.
Pour concrete in area around bottom drain and contour as per the following drawing.
Let the concrete dry install liner and then place drain cover on liner over pipe opening.
3 gravity flow bottom drains should optimally have a max flow rate of approximately 1800 gallons per hour and will service an 8 diameter pond b ottom nicely.
Cut a hole in the middle of the pipe the diameter of the pipe 4 pipe.
This is before you pour the concrete into the base.
Bottom drains you should fit your bottom drains while the pond is under construction.
4 gravity flow bottom drains should optimally have a max flow rate of approximately 3600 gallons per hour and will service a 10 diameter pond bottom nicely.
Bottom drains are considered a necessity in koi ponds or water gardens greater than 1 000 gallons where water quality and clarity are considered important.
Think of a koi pond as a swimming pool for koi.
After you ve got your bottom drains in get all the pipework for the bottom drains laid out in position as well cut to shape lay it then pour in the concrete.