Product review (1 stars): Measurements show zero improvement in filtering PPM
Like many I was intrigued by the favorable pricing compared to an OEM Samsung water filter replacement.  After installation and use, I would recommend sticking with the OEM product for the following reasons:

1) Using a digital PPM tester, I measured the local water here in Silicon Valley through our tap.  Typically the reading is between 255-265 PPM which validates the hard water we have here in the area.
2) Running filtered water (8-16 oz tests) through the OEM Samsung, we consistently measured 205-220 PPM.  Not great, but marginally better than standard tap.
3) Using the Waterdrop after installation and filtering roughly 5 gallons of water through the filter, the measurements are consistently the same as our tap.

The fit of the filter was excellent, but unfortunately this filter does ZERO when it comes to the Samsung application.  I'll likely take advantage of their return policy and let the next person fund their business.