The drain is constantly filled with water. In the water, we can add a little pest-control liquids and rat poison. This is done to prevent the rats from entering the house. These pests are a natural danger to the swiftlets and the birdhouse will not be effective if they are allowed to enter the houses.
Another advantage of the water in the drains will also adjust naturally, the humidity and the temperature in the birdhouse.
They may also be disadvantages of the drain. During the rainy season, it is important to continuously add in the poison and other liquids. It is also important to continuosly clear the drainage system of the dead and decomposing pests. The decomposition may lead to foul smells which will be bad for the birdhouse. Dirty waters may also lead to the breeding of mosquitoes.
For a stand-alone building with 3-4 levels, this drainage system is very useful. I would reccommend this for these kinds of birdhouses.
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