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This shows the detail of the larger pipe. You can make the airlifts from any size pipe. When we make a system in remote locations we often do not have a store to go to for fittings. This method can be used to create airlifts from any plastic pipe you have.

We use two of the tanks with the under gravel plates. One of the tanks will be used as a plenum - that is a space under the sand bed. The other tank will be used as a filter. A deep sand bed is commonly defined as a bed of medium size sand with a minimum depth of four to six inches which ensures that a portion of the sand at the bottom will not be exposed to significant circulation of water.

An established deep sand bed consists of sand populated with bacteria, algae and other marine organisms such as worms, crabs, snails and stars. The creatures burrow and overturn the top two to three inches of sand in search of food, which causes water to circulate deeper in the sand than it would if the creatures were not present.

Deep sand beds may be made of a variety of materials, but typically medium sand is used. A larger particle size increases circulation, which in turn requires greater depth to establish anaerobic areas. Larger particles can also inhibit the burrowing of small animals, which would limit circulation into the bed. Additionally, larger particles are prone to detritus accumulation, which necessitates periodic siphon cleaning.