Product review (2 stars): Didn't seem to do much filtering
I gave an extra star, because the cartridge fit into my LG fridge as advertised, without any leaks or problems. However, I do not believe that this cartridge served its main purpose, which is to filter the water.

After installation, I flushed water for quite a bit over recommended 3 minutes - that would have worked out to about 6 quarts - but I did about 2-3 times as much. I have a water quality tester, which measures TDS (Total Dissolved Solids) in PPM - parts per million of particulates. My tap water isn't so great and had 425 ppm (Federal recommended level for drinking water is less than 500 ppm - so I am close to those limits).

I expected drastic reduction after filtering. After all, the insert shipped with cartridge advertised 99.8% average reduction in "Nominal Particulate Class". Moreover they advertised as meeting "NSF Reduction Requirements" which has to be over 85% reduction.

However, I was getting about 410 ppm in the water that went through the filter. That's a tiny 3.5% reduction! Thus, I believe that this filter is not doing much filtering.

Taste wise, I also didn't notice much of a difference.