SIMPLEST WAY TO GET THE CLEANEST DRINKING WATER. Enjoy clean and refreshing water back from your loving Portable Water Bottle with Filter Replacement Water Filters. Compatible with Hard Sided Bottles and Sport Bottles. GREAT FILTRATION AND WATER PURIFICATION. Our Filter Replacements are made of coconut shell activated carbon and 100% similar to filters. Effective in filtering silt, bacteria, chlorine odor and taste and heavy metals just as original filters 4 FILTERS IN 1 PACK. We recommend replacing your water filter every 40 gallons or every 2 months whichever comes first. We have bundled 4 replacement water filters as a single pack, so you have enough supply of filters for up to 6 Months. BETTER FOR YOU - BETTER FOR THE PLANET. With our Water Filter Replacements, you don’t need to discard the bottle once the lifetime of the filter is over. Also, one water filter can replace up to 300 standard 16 ounce plastic water bottles. This will help save the mother nature and allow you to save money as well