Denicotea Crystal Filters - 60pc includes 6 packs of 10 replacement filters for the low price of $17.00! Add two to your cart and enjoy free shipping! Denicotea crystal filters use a silica gel of highly porous structure that reduces tar and nicotine from tobacco smoke to a high extent. Filters will change color from clear white to dark brown displaying the effect of the filtration and it indicates when the filter has to be changed. Only the original Denicotea filter has the red cap!. 60 piece filters are sent in 6 individual 10 filter blister packs.