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Backflow is caused by backpressure (pressure on the house side of the meter is greater than the supply side) or by backsiphonage (negative pressure causing substances to be sucked into the supply lines). Backsiphonage (the effect is like a soda straw) can occur when a leak, line break or heavy usage causes the pressure in water lines to drop below the pressure in other areas of a home. Both cause a reversal of normal water flow, possibly drawing contaminated water into the public water supply system.
Sources include: cooking oil, butter, margarine, lard, shortening, gravy, sauces, sour cream, mayonnaise and oil from cooked meats. Here are some tips to keep your drains fat-free:• Use paper towels to wipe greasy dishes before washing.• Use sink strainers to catch food waste during washing.• Put food scraps in the compost or in the trash.• Use a container, and store this waste in the freezer. Then, put it in the trash after it has hardened.• Never pour grease down the drain or into a toilet.• Paper items, feminine products, baby wipes and disinfecting wipes should not be disposed of down the toilet.