PURPOSE: To make it possible to filter fine particles dispersed in a liquid efficiently, remove oil suspended in a liquid selectively, enlarge a contact area between a liquid and an air, inhibit the liquid from becoming anaerobic with the effect to ameliorate the quality of liquid and deodorize it.

CONSTITUTION: The filtration absorber comprises a storage container 1, a compression device 3 which is freely adjusted to compress a filtration absorbent 11 of chemical synthetic fiber such as rag-opened polypropyrene and granular activated charcoal which is filled in the storage container 1, and a water injection plug with a molded plate 20. Thus the filtration absorption capability is enhanced, the liquid is prevented from becoming degraded and also is inhibited from becoming anaerobic with the removal of a septic odor.