Re: DIY sponge filter - how much sponge?

Nikki wrote:


whats a air lift? and how do you use it in place of a powerhead?
thanks nik



An air lift is a vertical plastic tube into which air is bubbled near the bottom, either directly or with an air stone. The mixture of bubbles and water is less dense that the surrounding aquarium water, so it rises. This technique is used to pump water through undergravel filters, sponge filters, plastic box filters and air-driven hang-on-back filters. With some of these filters you can use a powerhead on top of the lift tube, eliminating the need for an air pump.

Filters driven by electric motors are a fairly new thing in home aquarium-keeping, with widespread use beginning in the 70's. Before that, filters used an "air lift" and some still do. Of course, at one time people used kerosene and alcohol lamps for heating, too :) .
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