Aquaponics Design Course.
21—31 Hives Road North Maclean Qld 4280 Australia.
www.aquaponics.net.au 07 3200 0272
Auto siphon parts.
RULE for adjustment.
If the siphon dribbles but will not start, you need
more flow.
If the siphon tries to stop and will not, there is too
much flow.
Adjust in small increments until success.
Bell. Made from 65mm (2 11/16”)
PVC pipe.
Cut to 250mm (9 7/8”) Cap glued
on securely. Must be airtight. Use
50mm (2") pipe if you can't get the
right size. 50mm is not ideal but
will work,
Drill 12mm
(1/2”) holes
around the
bottom as
close to the
bottom and
as close
together as
possible.
Drill 6mm (1/4”) hole in
cap to allow air to freely
pass when bed is empty-
1 1/4” x 1”
socket reducer
Spears #
429-168
Overall
height
190mm
(7 3/8”)
Outer shroud. To
keep the gravel
media away from
the bell siphon.
Drill numerous
6mm (1/4”) holes
to allow good
drainage.
25mm
(1:) pipe
cut to
140mm
(5 1/2”)
100mm pipe cut to
265mm long.
(10 3/8”) The cap is
then glued on to
make the overall
size 320mm
(11 1/2”)
Valve
adapter.
Spears#
336-010
Tank Fitting 25mm (1”)
Product # RXTTI 25
This elbow is normally set to
hori-zontal . This can be
adjusted up-wards in very small
increments to create a little
back pressure to assist the
siphon to start. Not always a
necessary adjustment.
Female threaded end
90 degree elbow
Spears # 406-010
90 degree threaded
socket elbow.
Spears# 307-010
The "Spears" parts are common in
the USA and also at leading
hardware stores in Australia.
25mm (1”) pipe cut to suit but is
normally 265mm (10 1/2”)
Do not glue these parts together.
Aquaponics Design Course.
Page 2
90 degree elbow socket socket
Spears # 408-010
32 x 25mm
(1 1/4” x 1” )
reducer for top of
up stand.
Spears # 429-168
90 degree elbow. One end is a glue socket and the
end shown is threaded to suit 25mm (1”) Threaded
end can be clearly seen.
Use this fitting to screw directly onto the black tank
fitting coming from the bottom of the auto siphon.
Spears # 307-010
This fitting may not be available in all areas.
Note the type of up stand, shown at left, with the reducing coupling on top instead of a straight ended up
stand.
In theory it assists the siphon to start more easily.
In close tests we have found that it is more beneficial
in assisting the siphon to break or end when the tank
has been siphoned down.
It also appears to give the siphon a wider flow operating range, although the advantage is not that much.
By employing this type of up stand it is possible to
abandon the clear plastic breaker pipe shown fitted to
the bell in the photo on page 5, thereby saving some
parts cost.
Overall height of
this type of up
stand is
190mm (7 3/8”)
Valve Adapter
25mm (1”)
Spears # 336-010
Aquaponics Design Course.