Product review (4 stars): Some Facts About Home Water Filters
I find it odd that neither Whirlpool or Bosch have a detailed listing of the contaminants removed by the filter.  Some reviewers have hinted at differences which are not explained in either product description.  To clear my mind before ordering a replacement WHKF-R-PLUS, I did a little research.  The Bosch filter description lists a "NSF/ANSI Standard 42" Certification.  Checking the NSF Website, here's what I found: "Residential drinking water filters are covered by two industry standards: NSF/ANSI Standard 42 and NSF/ANSI Standard 53. The standards are identical when it comes to evaluating the materials safety and structural integrity of a filtration system (if connected to a pressurized supply), but each standard covers a different type of chemical reduction performance testing. Standard 42 covers aesthetic (taste and odor) claims, while Standard 53 addresses health-related claims.  In the website Whirlpool does not list any standard for their filter.  OK, what's the diff?

Standard 42: Reduces chlorine (taste and odor), chloramines, iron, manganese, hydrogen sulfide, pH neutralization and zinc reduction.

Standard 53: Reduces heavy metals (arsenic, cadmium, chromium, copper, lead, mercury and selenium), inorganics (fluoride and nitrate plus nitrite) and volatile organic chemicals (chloroform surrogate as well as individual organic chemicals).

I'm not a chemist, and this filter is used to filter the water line to my automatic ice cube maker.  I'm sure my city drinking water does not have all those nasty chemicals in any harmful amounts, so Standard 42 is more than adequate.  The Standard 53 filters may also include a performance indication devices (PIDs). PIDs inform the end user when the product has reached its rated capacity by a flashing light, audible alarm or by reducing or stopping the flow of water through the system.  If you live in Flint, MI, or have a well or other unfiltered water source, best find something with an alarm.

For making ice cubes, the Bosch filter more than meets my demands and is safe, and the price is about half of the Whirlpool original.  I'm ordering right now!