The AdvanTex AX20-RTUV treatment system from Orenco Systems is a self-contained module that treats typical septic tank effluent to better than secondary standards, with nitrogen reduction and UV disinfection. It’s designed for homes with up to four bedrooms and is especially suited for small sites with poor soils or that require shallow bury. It helps protect surface waters and aquifers and can be an effective solution for areas that have strict discharge limits, according to the maker. It is installed following a septic tank equipped with Biotube effluent filters. The unit eliminates the need for separate recirculation, treatment, discharge and disinfection tanks and basins, and it reduces the number of risers and lids needed in the treatment train. 800-348-9843; www.orenco.com.