ABSolute Flow Limiter (for small chinese aquarium pumps)

And now: the "ABSolute Flow Limiter"!!!

Do you plan to build an aquarium for your children by buying a small glass bowl, filtering and oxygenating its water with a very cheap chinese pump?

Good thought! You are a clever person! You're also going to save 20 to 30 bucks, if you compare the price of your new aquarium with the commercial ones!

You need of:
A small glass bowl (mine has a radius of 25cm... Yes, metric system! :-): not too far from 10,00/11,00 euro
A pair of kilograms of aqu