A Guide to Modern Koi Pond Construction
Skimmer pipework
The other main pipework that we must consider is the one for the skimmer. Basically the water is pumped from the skimmer and then back to the pond. It can be returned to the pond using another venturi, or you can divert it to a waterfall in the summer, or maybe a deep water return. This is a different pump to the one shown previously, and the capacity should be at least 1,500 gals/hr.
![[pipework layout layout]](img/fig24.gif)
![[Discharge pipework]](img/skim1.jpg)
The photo on the right shows similar discharge pipework in use. Valve A is the discharge from the pump, and then it divides into three outlets so the koi-keeper can switch to the one he requires. Note that bends have been used as much as possible instead of elbows to reduce the friction in the pipe.
Most installations are fitted with a time switch so that the pump comes
on a couple of times a day. It could be timed so that it is working when
you get up in the morning, and again when you return after work. The timer
usually has an override so you can use it at other times as well.
During hot summer weather some people prefer to keep it running and so provide more oxygen with a venturi or a waterfall.
Some people do suggest installing the heating system into this system,
but that would mean keeping the system running 24 hours per day. Another
problem in this part of the country is blanket weed which tends to block
the skimmer basket if running for a long time.
Also check out the page with installing a skimmer in the wall.
This page updated January 2004
This website started with a booklet which I made up originally for the help of those members of the BKKS - South Wales Section who were intending to start building a koi pond, and as the website has expanded more information and articles from other people have been included. This is for general guidance only, and we do not take any responsibility for problems that might occur by following these ideas. It is important that you check out everything in your area, and check on local laws and rules that may apply.