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MERV ratings range from 1 â 16 and measurements are in microns. Some of the common particles related to MERV ratings are pet dander, insecticide dust, smog, dust, viruses, wood, tobacco smoke, spores, bacteria and pollen. Some of the most common filters found in residential use only have a merv rating of 1 to 4.
DIY-Do It Yourself GFO PVC Media Reactor. Scroll down to see DIY-Do It Yourself PVC GFO-Granular Ferric Oxide Phosphate Remover Media Reactor Parts List And Directions. If you do not want to make this DIY GFO media reactor scroll down and see a media reactor using a R/O-Reverse Osmosis water filter unit.GFO-Granular Ferric Oxide Media should have a simular color and look of coffee grounds.FO-Granular Ferric Oxide Media only treats the symptoms not the source of the problem. Note: Use caution when using GFO-Granular Ferric Oxide Media, it can and will lower you alkalinity values, monitor and adjust you alkalinity as needed. Corals do not like alkalinity fluctuations, especially stony corals.