I have been a customer for over three years. We have to replace our filter every three weeks and I am OK with that. We are on a rural water system in N.E. Arkansas where the lime/calcium content is extremely high even after the rural water system increased out rates by 20% for so-called "water softeners" at each well...BS!  Zero Water filters are not cheap but well worth the money. I read comments where people are complaining about replacing every two months?? Please!! Try making coffee with our water where you have a clear film crust after the coffee sits for a few minutes. Ordering my next 12 filters today. Very satisfied customer.  If your water smells like fish, use your meter and change your **** filter. It's not freaking rocket science.