Manufacture and instal Clarifier Systems. The synthetic mesh screens are retrofitted into settlement tanks and humus tanks to reduce levels of suspended solids and consequently B.O.D. in the final effluent. The screens use U.V. stable,high open area precision woven synthetic mesh as the filter media(61% open area),which makes them easier to clean and able to handle higher flow rates. Automated cleaning systems are available. The screens retain biomass and polish the effluent before discharge to the water course. They can protect sand filters, BAF and SAF units, reed beds and grass plot from excessive solids loading. The mesh screens can usually be cleaned from outside the tank thus improving health and safety for the operator. The Locker Clarifier Systems have been installed into most types of settlement tanks including Dortmund, horizontal end-flow, and radial tanks.