Prefiltration is for removal lipids, colloids and particles from serum.
Sterile filtration is for removal bacterial to ensure stability of long term storage of serum.

①-Vent: GPF, HGPF
②-Clarifiltration: HPP, LGFP
③-Prefiltration: HPP,LGFP
④-Sterile Filtration: SPS, APS, LPV
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