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C. Conventional on-site system maintenance. <br /> I. Septic tanks for single family dwellings or commercial discharges should be <br /> inspected at a frequency of every two to five years to determine sludge and <br /> scum depths. Septic tanks should be pumped every two years if garbage grinders <br /> or dishwashers discharge into the septic tank. <br /> 2. Conservation and reduction of solids generated are recommended. Solids <br /> generation can be reduced by putting food scraps and nonbiodegradable items in <br /> the garbage and avoiding pouring grease and inorganic salts, such as detergents <br /> and drain cleaners into the sink. <br /> 3. If on-site water softener regeneration is necessary, minimum salt use in water <br /> softner is recommended. This can be accomplished by minimizing regeneration <br /> time or limiting the number of regeneration cycles. <br /> 4. Caution should be excercized in the use of certain detergents which, over a <br /> period of time, will clog the soil. <br />