100% recyclable BPA-free plastic bottle. This premium water is carbon filtered and then purified through reverse osmosis. It is filtered and ozonated prior to filling. This detailed filtration process produces a smooth, crispy tasting, delicious, purified water. This 4-gallon bottle is perfect for water dispensers. It has a no-spill system which makes for an easy bottle change. Use with top- or bottom-loading water dispensers–and it is compatible with most water coolers.