Aqarium AIR powered filter

This is my own project (prototype) of aquarium air powered filter
you need only connect 7mm hose from aquarium air pump and use sponge cube
you can choose ring with small holes or little bigger holes
because the PLA material tends to float, it is necessary to stick the whole filter on a small piece of glass, for example
on tube i created protrusions for threading stainless steel nuts for loading - you can try this.