Will this product work to this to kill sewer flies?

No...this product is not meant to kill sewer flies. It can help break down the grease on the pipes that attract the flies. We have another product does not kill drain flies, but if very effective in breaking down grease in pipes and this can help control your drain flies problem...you can see this product on following link...https://www.amazon.com/dp/B07BHXGV1P
Was this article helpful?
Thank you!