STAAR filter systems from SeptiTech are designed for a simple, automatic and reliable equalization and clarification process to treat high organic loads. The biological trickling filter maintains low levels of Nitrate-N with all below-grade components that fit in concrete, plastic or fiberglass tanks. Its smart system is designed to recognize situations dealing with peak, low, intermittent or no-flow conditions, allowing the system to go into a sleep mode that dials down activity and eventually shuts all power off until normal flow conditions are detected, leading to lower operating costs and power requirements. It treats 100 to more than 150,000 gpd. 800/318-7967; www.septitech.com.