Product review (1 stars): Black  material in filtered water.
No problem installing it.  Also it doesn't leak.  However, even after flushing a new filter as instructed, there is a severe intermittent failure mode: black fiber looking material shows up in the filtered water.  This didn't happen with the original filter.  Could this be the filter material?

I've tried two filters so far.  I suppose I'll try the last one and then try a more expensive option.