"Filtralite is extremely durable in two-step biofilters. Filtralite* has proven extremely durable as both bio substrate and sludge filtering medium. After 25 years of operation with daily backflushing, there is no need for replenishing.
The unique bio filtering process consists of «nitrification» bio-filters, each followed by «de-nitrification» biofilters. The nitrification step is an aerobic biofilter that consumes dissolved organics, converting to sludge, carbon-dioxide, and nitrate. The substrate is Filtralite HC 2,5-5 (crushed fragment). In the subsequent anaerobic biofilter, the nitrates are converted to nitrogen gas. In this process, Filtralite HR 3-6 (whole extruded spheres) acts both as substrate and filtering medium.
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