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1 .0 System Preconditions <br /> 1.1 REQUIREMENTS: GSF systems must meet the local rules and regulations except as outlined in this <br /> manual. The California State regulations and the local regulations will be referred to as the guidelines in <br /> this manual. The sizing charts apply to residential systems only. <br /> Please contact Eljen's Technical Resource Department at 1-800-444-1359 for design information on <br /> commercial systems. <br /> 1.2 WATER SOFTENER BACKWASH: Water softener backwash should not be disposed of in the septic <br /> system. Water softener backwash should be discharged to a separate soil absorption field. <br /> 1.3 GARBAGE DISPOSALS: Eljen discourages the use of garbage disposals with septic systems. If a <br /> GSF system is to be designed and installed with garbage disposals the following measures must be taken <br /> to prevent solids from leaving the tank and entering the GSF system: <br /> • Increase the septic tank capacity by a minimum of 50% or <br /> • Installation of a second septic tank installed in series <br /> • And a 50% larger leachfield <br /> Eljen requires the use of septic tank outlet effluent filters on all systems especially on those systems that <br /> have single compartment tanks, even if up-sized, and when the dwelling has a garbage disposal installed. <br /> 1.4 ADDITIONAL FACTORS AFFECTING RESIDENTIAL SYSTEM SIZE: Homes with expected higher <br /> than normal water usage may consider increasing the septic tank volume as well as incorporating a multiple <br /> compartment septic tank. Consideration for disposal area may be up-sized for expected higher than normal <br /> water use. <br /> For example: <br /> • Luxury homes, homes with a Jacuzzi style tubs, and other high use fixtures. <br /> • Homes with known higher than normal occupancy. <br /> 1.5 SYSTEM PROHIBITED AREAS: All vehicular traffic is prohibited over the GSF system. GSF systems <br /> shall not be installed under paved or concreted areas. If the system is to be installed in livestock areas, the <br /> system must be fenced off around the perimeter to prevent compaction of the cover material and damage <br /> to the system. <br /> 2022 California Design&Installation Manual Page 5 www.eljen.com <br />