What is required if a floor drain experiences evaporation of the trap contents?

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When a floor drain experiences evaporation of the trap contents, it results in a loss of the water seal that prevents sewer gases from entering the building. To mitigate this issue, the installation of a trap seal primer or trap guard is essential.

A trap seal primer automatically adds water to the trap whenever the water level drops due to evaporation. This ensures that the water seal is maintained, effectively preventing odors and gases from escaping through the drain. A trap guard serves a similar purpose by preventing evaporation in a more passive manner, ensuring that the trap seal remains intact.

Regular maintenance, a larger drain size, or frequent use of the drain may contribute to the overall health of the plumbing system but will not specifically address the issue of trap seal loss due to evaporation. Without the correct management of the water seal, there remains a risk of sewage gases entering the space, which can pose health risks and unpleasant odors. Therefore, a trap seal primer or trap guard is the most effective solution for preventing evaporation-related issues in floor drains.

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