Safe-Cone filters are unique and replaceable polyethylene filters that act as a final barrier to prevent any fluids and liquid vapors from reaching the internal components of the pipette. They protect the pipette and sample from contamination, prolong the pipette’s lifetime, and reduce maintenance intervals. Safe-Cone filters should be changed regularly and always in cases of over-aspiration.Standard Filters: For general applications. Can be used in same type of work as the Plus filter is recommended for, but needs to be changed more frequently. Plus Filters: For more demanding applications such as radioactive work, cell culture, bacterial and virological work and molecular biology.