I have well water and use a Water-boss Water softener, I have a House Filter before the Water softener and a carbon filter after the water softener that supplies the entire home. I used a TDS Meter, Digital Water Tester Model %23HFTDS-M7
I tested the water after I installed the Waterdrop 10UA Filter and here are the results:
Water straight from the tap is in the RED 352
Water that went through Waterdrop 10UA Filter in the RED 351
Water that went through my Samsung Refrigerator in the RED 305
Poland Spring Bottled Water in the green at 38
I would think that installing the Waterdrop filter would have made a bigger difference but just 1 ??? and the Samsung Refrigerator has a tiny filter in comparison to waterdrop and it did 46 better than waterdrop filter.
And yes, I let the water run for 5 minutes as directed and after 3 days of using the system I then performed the tests.