The GravityWorks filter system from Platypus is an easy to use water filtering system that eliminates the need to pump water. Simply fill the upper bag with untreated water and water will be filtered into the clean lower bag through the GravityWorks filter. The filter is able to clean 4 liters of water in less than 2-1/2 minutes. Empty, the system weighs just 12 oz and backflushing can be done by raising clean reservoir above the dirty reservoir for 4 seconds. Each reservoir holds 4 liters of water. Made in the USA.
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