The STAAR (Smart Trickling Anaerobic/Aerobic Recirculating) filter system from SeptiTech, a subsidiary of Bio-Microbics, uses an enhanced, unsaturated media filter technology to treat high organic loads. The 500 to 18,000 gpd systems use a simple, automatic equalization and clarification process to maintain low levels of nitrate with all below-grade components that fit in concrete, plastic or fiberglass tanks. Smart controllers deal with peak, low, intermittent or no-flow conditions. 800/318-7967; www.septitech.com.