2 sponges in the filter can be changed alternately so that the bacteria are divided into the next one. When servicing sponges, it is convenient that the container can be pulled out along with water and sponges in it. It happens that when you turn off and then turn on the filter, air stops flowing normally, but this is normal for this design. You just need to repeat off / on. At the moment when the water in the tube through which the air is supplied equals the water level in the aquarium, you must turn on the filter or try several times. I also implemented the idea from YouTube where the tube with air goes to the street, stretched out a 10 meter hose, the air goes normally. You also need to clean the hole in the filter on which the air hose is put on - when less air begins to flow. Well, the higher the filter is attached to the surface, the more bubbles.
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