Bests & Worsts Reviews from Amazon

Arrive today (A M.) Red dye test - completed 3 cycles of water before test- completed Unit rinse out before test - completed Question: what is the purpose of this filter? Question: why is the ppm higher after than the city tap? Question: why did the ppm exceed after the test using the city tap waters? Question: did I receive faulty filters? Question: are the filters only to test how the system can filter red food dye? Question: water that reads 526 ppm is it quality/safe drinking water?