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Toilets should also be flushed once before departure. This helps ensure the plumbing fixtures are left in a normal, ready condition.
This simple step is usually more useful than balancing objects over a sink. The goal is to protect the system at the point where the real barrier already exists.
How to Seal Drains Properly
If the trip will be longer, sealing the drain openings can add another layer of protection.
The easiest option is to use the drain’s existing stopper if the sink, tub, or basin already has one. Closing the stopper creates a better barrier than a loose glass.
A sink plug or rubber stopper that fits tightly can also work well. The key is that it should sit securely and limit airflow through the drain opening.
Silicone drain covers are another useful option because they are reusable, simple to place, and designed to create a better seal.
In a pinch, plastic wrap or painter’s tape can help cover a drain opening temporarily. These options are not fancy, but they can be more effective than a glass that does not seal.
The purpose of sealing the drain is twofold. It can help slow evaporation, and it can also create a physical barrier if the water inside the P-trap eventually drops too low.
Why Mineral Oil Can Help on Longer Trips
For longer absences, another useful plumbing trick involves mineral oil.
After running water through the drain to refill the P-trap, a small amount of mineral oil can be added to the drain.
About a tablespoon is enough for this purpose. The mineral oil floats on top of the water in the trap and helps slow evaporation.
This can be especially useful for drains that are rarely used or for homes that will sit empty for an extended period.
It is important to use mineral oil, not cooking oil. Cooking oil can become rancid and may contribute to unpleasant smells or buildup inside the pipes.
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