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LIST OF FIGURES Figure Title Page 4-10 Diagram of the Biotube effluent filter (left), Biotube Jr. installed on the 4-7 outlet of a septic tank, and larger Biotube filter installed on the outlet of a constructed wetland (right top) 4-11 The Premier Tech effluent filter 4-8 4-12 The Presby Maze septic tank insert 4-8 4-13 The Polylok modular effluent filter can be customized for flow rate 4-8 4-14 The NCS gravity effluent filters 4-9 4-15 The SimfTech effluent filter 4-9 4-16 Zabel effluent filters (form left to right) Models A600, A1800 (internal), and 4-10 A1800 (external) 4-17 Zoeller effluent filters for residential and commercial applications 4-10 4-18 Butyl resin sealent applied to the rim of a precast tank 4-10 4-19 The Universal Liner completely seals septic tanks to prevent leakage. 4-11 5-1 Diagram of Nitrex unit and installation of a Nitrex unit to receive effluent 5-3 from a sand biofilter 5-2 Diagram of residential RUCK system 5-6 5-3 Diagram of commercial RUCK system 5-6 5-4 A diagram of the Glendon Biofilter system, the installation of a Glendon 5-9 Biofilter, and a completed system at a residence 5-5 Diagram of the UASB treatment process 5-10 6-1 EnviroFilter modular treatment unit cutaway view showing multi -layer 6-8 design and system installed with drip irrigation system 6-2 LECA material with particle diameter of 0.3 to 0.4 in 6-11 6-3 Utelite expanded aggregate (available in coarse, medium, and fine sizes) 6-11 6-4 Filtralite aggregate media 6-11 6-5 Diagram of recirculating trickling biofilter process (note: recirculation to the 6-16 septic tank is also common and does not require an additional mixing tank) and multi -pass gravel trickling filter installed at a residential site in Stinson Beach, CA 6-6 The RIGHT System for wastewater treatment 6-20 6-7 Diagram of single -pass trickling biofilter process and installation of a 6-22 single -pass sand trickling biofilter 6-8 A photo of the Ecoflo biofilter wastewater treatment unit and diagrams 6-29 showing bottomless Ecoflo biofilter system in pressure dosed configuration and gravity flow configuration 6-9 A Natural peat bog in Canada 6-31 6-10 Installation of Puraflo peat biofilter system and completed installation 6-35 6-11 Orenco Advantex wastewater treatment systems under evaluation at 6-38 University of California, Davis, installed at a residential location, and a diagram of the system installed with a septic tank 6-12 Aerocell treatment system with primary treatment, distribution tank, and 6-40 modular treatment units 6-13 A diagram of the Bioclere wastewater treatment system and installed 6-42 xu