用biological filter造句子，“biological filter”造句

A down-flow biological filter is used for the groundwater iron and manganese.

biological filter, trickling filter

Experiment and research of wastewater treatment in city by anaerobic biological filter in series

Down stream anaerobic biological filter where waste-water poured from top was used as anaerobic processing device in which bacteria colloid was found on padding in biological membrane form.

The superiorities of the biological filter and activated sludge were synthesized to increase the treatment efficiency.

contact biological filter

While not strictly necessary, your pond can benefit from having a pump and biological filter to keep water cleaner.

biological filter loading