The filter has two disadvantages. Firstly, the flow can not be regulated. It is relatively strong. Second, one must always fiddle a bit, so that the filter is adjusted so that it is not booming. If you've got it, then he is really running quietly.
Addendum:
I have found a way to save a lot of money. The coarse blue filter wool that is used in the filter, you can conveniently buy a "giant mat". It saves tremendous. Just look at Amazon. The mat is then cut to fit at home. The white cotton of course you can replace it with something else.
Addendum 2:
I have the filter now about 3 years in use. Unfortunately, the cable to the pump has become porous. The lime has roughened outer skin of the cable so that the wires were exposed. This has been a little annoyed. However, I now had a blessing in disguise. Of course I had to replace the pump immediately. So I bought the pump separately as spare parts for only 21. The pump has now been further developed and is processed much more sense. Before the pump was in a separate housing from which they could be difficult to remove for cleaning. In addition, this case has sometimes taken care of noise when it landed the wrong way. Now the pump is processed so that they no longer have to be stuck in a housing. They can then put into the device in the filter. The cleaning runs smoothly and simply.
