Two plant based carbon filters will filter up to 60 gallons or four months of use leisure lakes bikes are one of the uk39s leading stockists of camelbak accessories take a look at our extensive range and save 10 off the rrp the small camelbak groove replaceable filters are made of sustainable plant based coconut carbon they can be purchased in packs of two or six changing the filter is as simple as unscrewing the top from the bottle and twisting off the straw the filter is housed at