Filter has been used for roughly 100 liters. Because we moved to a condo unit that did not have a compatible hook up for the filter we are forced to sell it. I am adding a full replacement set ($90) Compatible With Standard Faucets. Will Not Work With Pull-Out Faucet, Special Size Designer Faucet And Sprayer Faucet Top Tier Ultra Pure Drinking Water System Refreshing, Crisp Taste Superior To Bottled Water Systems Built With Super Long Lasting US MADE Filters Made in USA 90 Gallons/Day — Complete 4 Stage System Portable Convenient Drinking Water No Installation, Just Plug & Drink Weights Only 7 Lbs. Best Travel Companion Friendly Lifetime Customer & Tech Support