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Remove debris and particulates from water with the Water Bottle Pre-Filter from SteriPEN. The 40 micron durable nylon screen removes debris and particulates from your water, preparing it for treatment with a UV purifier. Designed for 32 ounce Nalgene bottles, this pre-filter will work with most bottles with a wide mouth. When used with the SteriPEN Classic 3, Ultra or Aqua, it forms a watertight seal.
Reversible cartridge for compact, convenient storage
Dual water seals to prevent contamination of drinking surface
Used with Nalgene and similar 32 ounce wide-mouth water bottles