The Lifesaver Pre-Filter Disk is a vital part of the Lifesaver Water Filtration System as it allows users to fill their bottle in whatever water source is available and helps to protect and extend the life of the Ultra Filtration unit by stopping large particulates, mud, sticks, and gravel from ever getting in the bottle.
Additionally, the sponge pre-filter can be used to scavenge water from leaves, grass, and shallow puddles in the event that a ready source of water is not available-a big plus in a survival situation.
Compatible with either the 4000 and 6000 model filtration bottles.
Manufacturer recommends replacing the pre-filter after six months of regular use.
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