The gravity fed glass bead fluidized bed biofilter was inoculated with 500 mls of biologically active fine grain quartz sand. The 300 gallon monster fish system was running at 1 ppm ammonia. With in minutes of inoculation the effluent of the sand filter was at 0 ppm. Within two hours the ammonia was non-detectable.
The fine grain quarts segregates to the top of the glass beads. The sand can been seen as a one inch band of tan across the top of the blue glass beads.
