Product review (1 stars): DO NOT BUY!
It is better to buy your refrigerator brand filter than to waste your money on these filters.  I checked the water after running 3 gallons of water through each of the 3 filters I purchased and each one is only 10 better than our tap water.  Our tap water is 311 and the new filter I just added is 301.  Unbelievable!  I just looked at the box and the filters contain coconut carbon from coconut shells rather than charcoal.  It might be greener but it certainly does not give you clean water.