INSIDE THE CANAL:
• Measure 150mm from the side of the
canal centre across the width of the canal
as indicated in the diagram above. Mark
a dot at the bottom with your permanent
marker.
• Drill a 25mm whole in with a hole saw and
lightly sand down the edges to remove the
fluff.
• Cut a 25mm running nipple in half (keep
other half to use on another canal) and
place it in the hole.
• Place a rubber gasket on either side and
fasten the running nipple with 25mm PVC
locknuts.
• Attach a 32mm x 1” Adapter Socket
(Female Thread) on either side.
• Inside the tank, insert a 25mm PVC pipe
in the adapter and measure the vertical
distance of 300mm from the bottom of
the tank. Mark this length and cut three
standpipes to size (additional two for the
other two canals).
•
Once inserted, cut a 320mm piece of
50mm PVC pipe. Cut slots 15mm deep into
the pipe at 20mm. Once completed, place
the float guard over the 25mm Standpipe.
BELOW THE CANAL:
When designing a system using gravity flow,
it is very important that drainage pipes must
AgriKultuur |AgriCulture
run at a slight angle, usually a minimum of
1mm for every 100mm (1: 100) of length to
the lowest point. In our case, our water levels
balance out on atmospheric pressure on the
surface of the water. The water levels in the
canals are higher than the 50mm outlet in the
biofilter thus trying to balance out the water
levels by forcing the water out.
• Cut three lengths of 25mm pipe 100mm
long and insert one length into the bottom
adapter. The other two is for the other
tanks.
• Attach a 50mm x 25mm Reducing
T-junction Solvent Socket to the 100mm
pipe. Do the same for all three tanks with
the 50mm sockets of the T’s following the
run of the drainage pipe (see previous
diagram).
• Once done measure the distance between
the shoulders of the reducing sockets and
add 25mm either side to compensate for
the insertion of pipe into sockets on either
side.
• In canal 1, insert a T-junction in line with
the biofilter and cut a piece of 50mm pipe
after measuring the distance between the
head of the T-junction and the socket of
the biofilter.
Construction of Water Inlets:
The water is pump via a 32mm PVC pipe
from the biofilter and the flow split into a
T-Junction, 20% to the DWC canals and 80%
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