How to Seal Basement Water Traps With Oil

A layer of oil keeps your floor drain sealed

Keep water seal in your floor drains from drying out with a thin layer of cooking oil. It'll keep foul odors out of your house.

By the DIY experts of The Family Handyman Magazine

Add cooking oil to floor drains

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.

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