Product review (3 stars): We usually go like 1/2 a gallon and just use it
These seem to wear out really quick, and are pricey. Unfortunately that's the only thing that works for our refrigerator. Also, to get them started you are supposed to run some ridiculous amount of water through them to clean them (like 3-5 gallons). We usually go like 1/2 a gallon and just use it. It uses up like 7% of the filter just doing that initial part. Honestly, we just keep using it after it says it's done because the water tastes fine for a while. So, I guess they don't wear out as quick as they say they do...either that or we are just super cheap LOL.