![]() ![]() ![]() Removing the lift tube can certainly make for a more attractive sponge filter, but it’s important to realize that the lift tube plays an important role in how your filter works. Increasing the size of your filter lift tube instead.However, Even without a lift tube, Your filter will still function.As soon as the front of the chain starts to move (pushed by air) the rest of it follows like lemmings off a cliff. Water likes to follow water (think of a bunch of molicules holding hands in a big chain). Here the airstone is at the base of a chimney which forces the water back up. Down through the media to the bottom of the container. Water it drawn through the top of the box. The air stone here is located below where the media would be. ![]() It works on the same principle but is a bit more well designed to take advantage of water's tendecy to flow. Water it drawn through "media" to replace water that has been forced up. The action and reaction of the sponge filter and the UGF filter works the same way. The same thing would occur if you simply wedged the end of the airline into the sponge (or placed it in the tubing). There isn't so much a change in density as simple displacement. With the water displaced and the air that displaced it moving up the tubing water is drawn in through the sponge to replace it. In the tubing the displaced water has no where to go but up the tubing with the air bubbles. ![]() Air bubbles require a certain about of volume and to have that volume they need to displace an equal volume of water (similar to putting a finger in a full glass of water or working in you're tank one you've filled it up all the way). What happens is air is pumped into the aquarium via the air stone. I think you're confusing density and flow. ![]()
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