This filter features a 6L capacity suitable for group water needs. It utilizes a 4-stage filtration system, including a 0.1-micron ultrafiltration membrane, to remove 99.9999% of contaminants. The detachable mouthpiece allows for easy backwashing with common bottles, eliminating the need for an extra syringe. Price drops from $39.99 to $32.99 to $23.09 when you apply the coupon code "30GWFPRO" at checkout. Free shipping for Prime or on orders over $35.