Why do you think the company would include the tube if it didn't do anything, that would be wasteful on their part.
I don't know a way to prove this, but I promise you without the tube there is diminished suction. With the tube in place, the water has a chance to contact and push 6-8 inches of water up and out, which pulls new water in behind it down low in the sponge. This means that the air bubbles don't come in contact and push a lot of water up, which is what creates the suction. Without the tube, where the air is released from the airline and where it exits the top of the sponge is a very short distance. If it is below/inside the sponge then it really doesn't matter.īecause the sponge is only 3 inches tall or so. To sum things up, if the air being released is above the sponge, use the lift tube. If the air is being released lower in the sponge, the only place the water can come from is the sponge. What I mean is that if the air is entering the water above the sponge filter and you don't have anything directing the flow (lift tube) you won't pulling water into the sponge. Assuming where the air exits is far enough down in the sponge, it shouldn't make much of a difference. The lift tube insures that you aren't pulling water from above. When I originally spoke with the guy at the store he said that the difference is pretty much negligible. So right now if I pull off the tube, there is a larger hole in the layer of duckweed. With the lift tube I get less surface water movement than without it. The only real difference that I've been able to notice was in regards to my duckweed. It originally was missing the lift tube (clear plastic tube) but I grabbed some tygon tubing and made one myself. I have a sponge filter in my shrimp tank.
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