This is the drainpipe assembly with the caps installed.
It is just sitting on top of the container
for the sake of taking the picture. The output of the drainpipe assembly is hooked to a
"bulkhead fitting" sometimes called a
"bulkhead adapter". This keeps the output pipe from leaking where it passes through the filter container.
This is how the drain pipes look when they are installed in
the container. This container is 40 inches
There is a short piece of 1/2 inch pvc that hooks this up to the baffle assembly.
This is a close-up of the threaded bushing and threaded male adapter. Only 1 o ring is shown
but 2 are needed - one on the inside of the bucket and one on the outside of the bucket.
A 3/4 inch spade bit was used to drill a hole in the bottom of the bucket. The male adapter
and threaded bushing were then installed with a number 16 o ring on each side of the bucket.
The adapter and bushing are 1/2 inch.
This ball valve is used to set the flow to the same rate as the output of the filter.
The container used for the filter came with a top with 1 hole in the center. Another "vent" hole was added
on each side to allow air (oxygen) to circulate through to the water in the filter. The "vent" holes are covered by screens. This illustration shows the
baffle pipes hooked up through the top. They are just "friction-fit" into the adapter that has been installed in the bottom of the bucket.
The small holes in the baffle pipes are drilled with a number 50 drill bit. They allow the water to slowly flow into the filter. This keeps
the surface of the sand and the biofilm from being disturbed.
This is the drain that was added to allow the wet-harrowing water
to drain off. Note the screen
in the vent hole on top of the lid near the bottom of the bucket.
The hole for this screen was drilled with a 3/4 inch spade bit.
The completed filter hooked up to the automatic recirculating pump.
Please note:This is not a "production" model and is not intended to be aesthetically pleasing - it is strictly funtional.
Open this valve to allow water to flow through the filter
rapidly to wash the sand. Keep in mind that this valve, if open all the way,
will let water flow through the filter too fast for
purification. back to faq page
This is the pump used to recirculate the water.
It runs on 12 volts dc. supplied by a 12 volt
deep cycle battery
The pressure switch was added for dependabiltiy and
pressure adjustment flexibilty. The flow is controlled by
the ball valve shown above.
DANGER! do not use a 120 volt ac motor
in this fashion. This motor is outdoors under cover but still
not safe with 120 volt operations (either ac or dc).
The surrounding area is usually wet which adds to the
conductivity greatly increasing the likelyhood of a dangerous shock.
Although a fuse will not protect against electricial shocks,
it will keep a short or overload from causing extensive damage.
Always, ALWAYS, use a fuse of appropriate amperage
in your circuit.
Keep in mind, that if you are using a battery charger
that runs on 110 volts ac on your battery, you are effectively
connected to 110 volts ac. If the battery charger transformer
or circuit, gets wet or shorts out, there could likely be 110
volts at the motor with enough current to create a hazardous
condition without blowing the dc fuse. Consult a licensed
electrician before you hook this up. You have been warned!
This is the baffle before cleaning. Note the small piece of 1/2 inch
pvc at the center. That is how it connects to the bucket through the
top. It just frictions in. It won't matter if it leaks slightly because
the water will end up in the filter as it flows through the air vent.