Product review (4 stars): Great water pressure now
I had been taking the filter off and dumping out the water to clean
The filter. That works for about 3 times. After that , the filter is clogged and
does not allow much water pressure.
New filter fixed that.
Out of curiosity, I opened up a used filter.
It's a chunk of charcoal. Not anything fancy.

You can get a lot more life from these filters if you shake  out the water
Every few months.