Here's what other sites are saying:
SteriPEN Camp & Hike Prefilter Water Bottle Attachment SPPF. The Pre-Filter is designed to be stored directly on a wide mouth bottle and the SteriPEN Classic 3 or SteriPEN Ultra fit perfectly in the filter. Just insert SteriPEN in the filter opening turn the bottle upside down and gently rock to circulate light throughout bottle.
Features of the SteriPen Water Bottle Pre-Filter Removes debris from water so the UV light can effectively destroy the microorganisms in it Forms water tight seal with SteriPEN Classic 3, SteriPEN Ultra or SteriPEN Aqua Reversible cartridge for compact convenient storage 40 micron durable nylon screen Dual water seals to prevent contamination of drinking surface Used with NalgeneA(R) and other 32 ounce wide-mouth water bottles
SteriPEN Water Bottle Pre-Filter for Nalgene bottles and other compatible wide-mouth water bottles is an easy to use prefilter when your water source is a little murky. Quickly filter out particulates and debris for cleaner, clearer water before you treat it. Filtering out particulates not only makes the water more pleasant to drink, it's important for using your SteriPEN UV water treatment effectively - so the ultraviolet light can do its job. Filters down to 4 microns. Dual water seals for preventing drinking surface contamination (bottle threads). Also useful for those who use chemical treatments like Aquamira. This pre-filter is perfect for anybody using SteriPEN products or chemical water treatments. Weight: 2.3 oz, 65 g. Height: 1.85 in (47 mm). Diameter: 2.6 in (67 mm). 4 micron durable nylon screen. Reversible cartridge for compact storage. Dual water seals for preventing drinking surface contamination (bottle threads). Not intended for microbial removal
- Tahoe Mountain Sports
Description of SteriPEN Water Bottle Pre-Filter Wide MouthWhen clear water is not available, use the Water Bottle Pre-Filter by SteriPEN. The Pre-Filter filters out particulates and debris. Fits on Nalgene wide-mouth water bottles.
- US Outdoor Store
Before blasting the UV, do a little pre-screen with SteriPEN's SteriPEN Pre-Filter. This 40 micron durable nylon screen is great for removing particulates from water that is bound for your bottle. PRODUCT FEATURES: Used with Nalgene and other 32 ounce wide-mouth water bottles
- Appalachian Outdoors