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Press filters are special, high temperature resistant nylon bags with an extremely fine mesh (there are different mesh sizes you can choose from). You simply have to place plant material in the filter, then insert the filter in a special press. Filters are absolutely necessary while pressing pollen or resin – they ensure that the final product is free from plant matter. If you press dry herb, filters are optional, but they help prevent herb particles from contaminating in the final product. The smallest mesh filters (30u) are intended for pollen, medium mesh filters (50u) are best for obtaining rosin from pressed resin, while the largest mesh filters (120u) are for dry herb.