Add cooking oil to floor drains
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Add cooking oil
Fill the P-trap with water. Then pour a thin layer of cooking oil onto the water to keep the water from evaporating.
Under every drain in your house, there's a trap that holds water and prevents sewer
gas from flowing up into the air you breathe. But if you have a shower that's been abandoned
since the kids moved out or a floor drain that never gets used, the water in the
trap can eventually evaporate. That lets in stinky—or even dangerous—sewer gases.
The solution is a few ounces of cooking oil. Dump a bucket of water down the drain
to refill the trap. Then add the oil. The floating oil forms a seal over the water and prevents
evaporation—without raising your cholesterol.