How To Use A Venturi In Your Fish Tank or Aquarium
How To Set Up A Venturi
- Connect the tube to the appropriate outlet point.
- Ensure that the outlet point is connected to the filter and that the venturi outlet is vertical.
- Hang the head of the venturi outside the tank.
Et voila! Additional oxygenation!
Let's start this hub with a confession. I owned and ran an internal filter for many months before I worked out what the little piece of plastic tubing with the doodad on the top was. It was, they said, a venturi. But what was I supposed to do with it? The plastic tube went into a little outlet pipe for the filter, I could work that much out, but then what happened?
At first, I assumed that the water bubbled up through the pipe somehow and made bubbles on the surface of the water. So I tossed the venturi in the tank, connected it all up, and swore at it when it did nothing but float there limply on the surface of the water.
There is very little information out there about how to use a venturi. The best I could get by googling was a multitude of results for fish tank filters that included venturis. Not very useful as I already had my venturi and it didn't do anything at all.
It wasn't until I found the need for extra oxygenation in my tank (with the addition of a chiclid, after keeping Bettas, who breathe from the surface of the water and can get by with minimal oxygenation in their water,) that the venturi issue came up again. This time I found answers.
What Is A Venturi?
A venturi is a simple device consisting of a tube which is narrow in the middle. In most aquarium venturi's the plastic nozzle at the top contains the narrow point. When a flow of water is applied to one end of the tube, it creates a vacuum, sucking air in from the outside world. The air mixes with the flow of water, and in an aquarium, bubbles to the surface. A venturi is simply a device designed to oxygenate a flow of water.
How Does A Venturi Work?
Now I knew what the venturi was for and how it was supposed to work. You don't let the head of the venturi rest on the water, you hang it outside the tank. Once again I puzzled at it, sticking it into my filter as before, and once again, it failed to work. Now it hung limply outside the tank, whilst, under the water, the current was undisturbed.
Like a cave person investigating a strange phenomenon, I tried breathing down the venturi tube. At once, many tiny bubbles poured out of the filter. Success! But limited success. At present time my life does not allow me to spend all my days breathing down a tube next to my aquarium.
Assuming that it was broken, I twisted the bottom of the venturi, by the filter, turning the little nozzle to an upright position, lo and behold! It sprang into action, with thousands of bubbles merrily making their way to the surface of my tank, oxygenating the water.
And that's how a venturi works.