- Nov 18, 2001Well this has been asked about quite a bit of late so
i'll put my 40 cents worth in.
Firstly, this is not the *only* way, nor the easiest
way, nor the best way it's just my way and for me it
works well. But it has some advantages over other
This system, uses a tube that is essentially sealed,
so unlike other designs, you can fill and forget,
rather than watch for overflow or needing to top it up
all the time. It is also designed around a 25ltr wash,
so will process about 10 ltrs of 40% spirit in a
single pass in about 36hours.
Secondly I apologise for the drawings, when it comes
to Artistic, I'm all Autistic.
1 x 500mm long 50mm diameter upvc pipe
1 x 50mm end cap
1 x 50mm threaded adapter
1 x 50mm threaded end cap with O ring
1 x poly pipe barbed adapter (see drawing/see text)
1 x Caulking gun glue tube nozzle
1 x Aquarium air tap
1 x 1 meter+ of silicon aquarium air hose
20ltr drum with tap
Container to collect treated spirit (I use a
Some coffee filter paper
Some untreated spirit
Note. The poly pipe barbed fitting is the barbed part
of the poly pipe adapter that screws to a tap and has
the barbed part to attach some poly pipe. See
After studying my ordinary drawings, drill a hole in
the centre of the end cap to suit the nozzle. This can
be glued into position with silicon, from the outside.
The end cap can then be glued onto the end of the main
pipe. The barbs on the poly pipe fitting need to be
filed down flush with the outside of the fitting, then
a suitable hole drilled into the centre of threaded
cap, and the poly pipe fitting glued into place. The
threaded adapter can be glued onto the other end of
With the main filter unit built, all you need is a
short piece of plastic tubing to fit over the barbed
poly pipe fitting, then other end fits over the end of
a standard drum tape (not the cobra/flip type tap)
To the caulking gun nozzle attach a short peice of
silicon tube. The other end is attached to the air
tap. A longer peice of silicon tube is used from the
tap, leading into the collection container.
When you are ready to use.
Cut two layers of coffee filter paper to fit inside of
the main pipe. Push these inside the main pipe until
they rest at the bottom against the end cap.
Fill your main pipe with activated carbon, to 50mm
from the top.
Pour the carbon into a glass bowl and pour boiling
water over carbon. Stir, leave sit for a couple of
minutes and pour off the water.
Repeat about five times until water above the carbon
Rinse filter housing. And fold silicon tube and clamp
with a clothes peg. Fill tube with fairly warm to hot
Pour off excess water from carbon and using a desert
spoon fill tube with the carbon. Once filled, screw on
threaded cap and top up water in filter. Push the
clear plastic tube over the tap of the drum which has
been filled with untreated spirit at 50% or less, the
drum has also been suspended from the garage roof
Turn on the drum tap and adjust the aquarium air tap
until the flow is quite fast, feel the filter pipe, as
the spirit flows thru the pipe will cool, letting you
know how far the spirit has flowed.
Let the spirit flow fast until about two thirds of the
water has been displaced. The water can be chucked,
adjust the air tap until the spirit is just flowing,
about 2 drips a second.
Relax and wait for some smooth tasting, non smelling
This works very well for me.
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