Go first and then turn left:

If the water inlet pipe is not inserted to the bottom, the filter material in the lower bucket will hardly work. It is inconvenient to fix the pump upside down, which will cause excessive noise.

Look to the right:

Because the barrel wall is generally round, it is difficult to seal the outlet pipe on the side, and it is even more difficult to seal the power cord.

Suggestion:

1, based on the left figure.

2. Extend the water inlet pipe to the bottom of the bucket.

3. The submersible pump is still put in the fish tank, and the water is pushed into the bucket with a pipe.

4. Connect the water outlet pipe to the rain shower pipe and return the water to the cylinder.

Note: Due to the limitation of the pump head, the drop between the self-made bucket and the master cylinder should not be too large. The barrel is mainly composed of biochemical balls and ceramic rings. Do not put high-resistance fine cotton.