This is the water filter element for the Katadyn Stainless Steel Pocket Water Filter. Ceramic element that keeps working up to 13,000 gallons of water.
Model FM-3700B attaches easily to your faucet. I had this very model. Light on the filter lets you know when to change the filter. Removes 99% of lead and some pharmaceuticals.
The TMJRF2 countertop water filter removes over 90 percent of arsenic and fluoride. The TapMaster JR F2 takes out up to 98 percent of chemicals like chlorine. Attaches to your faucet.