Product Q&A

Andrea from Portland, Or writes

Would these dunks work for drain flies in a drain?

The drain in our basement for the water heater always has standing water, as it should, but this year we keep having drain flies there. I dump boiling water in there regularly, but they keep coming back. It's been snaked already. So now I am wondering if putting a dunk in there would work? I see a previous answer that this product is effective for drain flies. Awesome. But I am wondering if it is safe in a drain with standing water? Or is there a better product? Thank you!