Many pond builders have found that adding a bottom drain helps keep a pond cleaner. Fish waste and other muck that accumulates on a pond bottom can be easily removed by a bottom drain. Ponds that are over 2' deep can become stagnant without a bottom drain.
Installed under the liner, flex PVC pipe carries the water under the liner to the skimmer box. Bulkhead fitting is installed in the skimmer, a PVC male adapter connects the flex PVC to the bulkhead fitting. The valve is placed inside the skimmer box to control flow. When the pump is turned on, water will flow into the skimmer through the skimmer faceplate (surface water) as well as the bottom drain.
You can control how much water goes in through the top/bottom inlets with valve (included)
Kits include bottom drain, bulkhead fitting, valve and fittings - does not include PVC pipe
BDK3 kits include EBD4N bottom drain and are intended for use with 3" pipe
This custom bottom drain utilizes the same 4" aerated drain with advanced modifications by Koi Filtration Expert Kent Wallace, to include a VPR or Vertical Pond Return, allowing water to be returned to the...(click on product image for more details)
A great versatile Aerated Bottom Drain Koi Toilet I for Koi ponds and hybrid ponds. Sweeping bottom design eliminates trapped debrisFull 4" height on the horizontal discharge pipe1" Air Dome supply...(click on product image for more details)
The Simple Solution for Koi Pond Bottom Drains
Made of heavy duty injection molded ABS.
Thick flange and liner ring for better liner grip.
Flare design for smooth flow.
Fits 4 inch Sch40 PVC Elbow...(click on product image for more details)