Product review (1 stars): Filters Leak Carbon
Upon opening, noticed granulated carbon spilling from the unit. Called Customer Service who reported that that was common with their replacements. Representative suggested that I install anyway and after 3 gallons of black water it should be OK. If still black after a day or so, cartridge is defective she opined.  Never experienced "black water" with the GE product.

Don't waste your money.