Product review (1 stars): so it wasn't a bad reading. We did this test after at least ...
Our water purification meter indicated 27% impurity. I retested our meter in distilled water: 0%, so it wasn't a bad reading. We did this test after at least 5 gallons were processed through the filter. I returned this item and bought another brand, which gave us 0% impurities. Maybe we got a dud?