Carbon Fines In GAC Water Filters
Carbon fines from GAC water filters and pure water filtration systems
Why is there black or gray water coming from my new filter?
Small particles of carbon called carbon "fines" are normal to be present in a new GAC filter when it is first installed. Carbon "fines" appear in water as a suspended solid that is black or gray in color. They are generally only noticeable when new filters are first installed. They are also generally found more in GAC (Granular Activated Carbon) carbon filters. All filters should be generously flushed with several gallons of water before used for drinking. Especially GAC filters should be generously flushed to wash away the carbon fines. This will wash away the carbon fines and make the filter ready for use.
EASY RO MEMBRANE PERFORMANCE CALCULATOR
SEE IF IT IS TIME TO REPLACE YOUR RO MEMBRANE
Simply enter your Feed Water TDS and RO Water TDS into the boxes below and click "Submit". The percentage of TDS Rejection will be displayed. We normally recommend membrane replacement once you drop below 75%. This may vary in areas with high TDS in the feed water.
See our selection of TDS meters under Water Tests.