Will this product also kill drain flies?

This product will not kill drain flies, but it will clean out the source of the drain flies. Drain flies are attracted by the oils, and fats that are stuck to the pipes. This products will clean the drain from those fats, and oils, and the drain flies will go away. Depending on the severity of fats and oils the drain has, we recommend a 4 ounce application for 3 to 4 days straight, to really clean out the pipes, and then you can give regular maintenance applications of 2 ounces weekly, or bi-weekly, to make sure those drain flies don't come back.
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