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  • Bottomless sand filters require an excavation depth of 4 to 5 feet minimum on a level site, and most of these systems are built in areas that would otherwise qualify as a gravel pit (where drainage is too fast to allow the time for treatment of the sewage within the oxygenated zone of the soil.) Either one or two feet of ASTM C-33 concrete sand forming what can be called in some places a liner or
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