Use Thermo Scientific Choice Syringe Filters to obtain cleaner sample extracts by removing interfering materials and fine particles down to the rated pore size. Thermo Scientific Choice Cellulose Acetate (CA) Syringe Filters are a good choice for filtration of tissue culture media, and for filtration of sensitive biological samples. Adding a syringe filtration step prior to chromatographic injection not only helps to ensure more consistent and reliable results, it also helps to protect instruments and prolong column life. Economic Choice Syringe Filters are available in a variety of sizes and membrane types to meet any application need.