Product review (2 stars): Hit or miss when buying from Amazon
I have purchased 5 of these filters from Amazon over the last two years, 2 of which were bad. Unfortunately in both case, the return window had closed by the time I realized it. The first bad filter released a flood of black stuff into the water right after installing, which evidently was the filtering material since it never worked. The second bad filter worked for about a month, then the water began to taste funny. After a week or so, the water was so bitter, it was undrinkable. Not willing to chance buying from Amazon again, I bought one at a local store, paying full price (ouch), installed it and perfect water again.

If you get a genuine filter, it works great, lasts 6 months at least. The price is outrageous though which contributes to the lower rating. Mainly I wanted to add my voice to others to beware of discount sellers if you buy here. You may not get a bargain after all.