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Inazuma filter strainer.
This strainer avoids the suction of the Hel-X media by an external pump in gravity mode, or the evacuation by the filter outlet in pumping mode.
The strainer is positioned inside the BioKompakt filter (1 strainer by two return fittings): it is made up of a tube-grid and two 110 mm elbows.
Required for all Biokompakt models unless a pump with strainer is installed directly in the bio filter in gravity mode.