Airlifter filter system

Effective filter system for fishtanks up to 100 Liter.

What you need:
some pipes inner diameter 17mm (i used electro pipes) cost about 1$
filter material (i use a 30mm filter mat)
an air pump for fishtanks

UPDATE:
I added a "parametric airlift" Freecad file so you easely can change the diameter of the pipe connection.
Open the file in FreeCad, double click on the Spreadsheet and change the diameter to what you need. The radius will be calculated
Be carefull, this one only works with the new Version 0.19 from FreeCad