The tube, which are connected the suction elements why not get to the bottom of the tank?

The tube, which are connected the suction elements why not get to the bottom of the tank?

The suction tube is just biased and not in contact with the bottom, but reaches about 50 mm from it, this is to prevent suction positos, gels, etc. oxide plates, which eventually are deposited in the tank bottom.
The ability of the same, when constructed, is already taken into account this “loss” of volume.

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