Pipework for bottom drains
After you’ve decided on the bottom drains, it is now time to consider what pipework you want to use and your layout.
You should use four inch diameter uPVC pressure piping. The pipework will be buried under concrete, so it is important that you choose the right type to use. Any failure in the piping system will mean a lot of headaches.
The pipe mentioned above is very expensive, and the majority of koi-keepers argue that as it is buried in concrete then it will not be disturbed and so will not give any problems if you use terrain pipe. It is said that this terrain pipe carries away all the waste from the house and is in constant use, but it should also be borne in mind that with a pond the pipe is under pressure all the time which does not happen when used for household purposes.
There are two different types of terrain pipework. One is grey and the other is rustic brown (orange) and measures 110 mm in diameter. The orange pipe is designed for use underground and is connected with seal rings. You should not use solvent with this type of pipe. The grey pipe is used for above ground, and they are joined together using solvent and fitted with seal rings.
Fixing pipework for bottom drains
1. Make sure that you cut the pipes to length accurately. Ensure that the pipe is cut perfectly square so that you get the right measurements.
2. Remove all the rough burrs on the cut pipes with a knife and emery cloth.
3. Clean surfaces with wire wool so that the adhesive will work well when you put the pipe work together. This removes impurities that may be on the surface of the pipe or fitting.
4. Make sure you use the right solvent on the right type of pipe. Apply the solvent to the surfaces of both the pipe and the socket, fit the parts together quickly, and hold in position for a short while.
5. Allow the solvent to cure once you’ve completed all the pipework. Put a full pressure test on the pipework to ensure there are no leaks before pour in the concrete.