Product review (1 stars): Huge disappointment.  Big mistake.
Huge disappointment.  There is a steady whistling sound as water flows through the filter.  The flow water is restricted.  Put the old filter back in.  I hate that the recommended filters cost so much, but this is not a mistake I'll make again.  Should have paid attention to a couple of the negative reviews I read about this filter.  Fool me once, shame on you.  Fool me twice....... that's not going to happen.