Product review (5 stars): Best PUR refrig filter to use...don't buy them from Whirlpool, get them here!
The big secret that I unfortunately found out the hard way is that if you buy this same filter from Whirlpool (it has their branding), they will not warranty the filter. Whirlpool refused to refund or replace the one bad filter that I had.

So lesson learned. Buy your PUR filters here at Amazon, and PUR backs all their filters with refund or replacement. I use Amazon's great subscription service that sends me the filter when I need it automatically. A great service.

This model of PUR filter is great! Produces great tasting water, and normally lasts up to 6 months (of course it depends on how much water you put through it).