I wanted the same thing without spending much money .

What I have is two plastic five gallon gasoline containers (they never had
gas in them) I put rigid tubing in each one with a little bit of the tube
sticking out of a hole I made in the top of them. These tubes go all the way
to the bottom of the tank I then put a lot of silicone at the hole to make
it air tight. Another rigid tube goes into the vent hole of each tank, again
I made the holes air tight with silicone. Then I tok an old air pump that I
had and connected it to one of the riged tubes with standard airline tubing.
and connect one container to the other in the same way. connect the air pump
to a timer and voila.
What happens is that the airpump will pressurize the gasoline container and
send water up the airline into your tank for a set amount of time. By
regulating the time that the timer is on, you can reguate how much water is
added daily. Just make sure that the end of the tube is dripping into your
tank and is not actually in the water, otherwise when it turns off the tank
water will siphon back into the casoline containers. This also works for
watering plants etc.
"Marc Levenson" wrote in message
...
Just in case you ca

http://www.autotopoff.com/

Marc


Dinky wrote:

I have found a couple auto-top-off plans on the net, but they are
either so poorly written that I cannot follow them, or include the
use of expensive pumps, switches, sensors, and valves. I'm not in a
position to spend much money at this point, but with the switch to a
refugium\sump from my bigass sump I took out has resulted in the need
for such a device.
I'm looking for a very basic system, gravity\siphon-fed. I can
build\fabricate most components myself, and have tubing, acrylic and
many other materials on hand.

tia

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