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Sara from Roswell, Ga writes,

Is Invade Hot Spot the product I need for drain fly larvae in a grout line?

I have drain fly larvae (black "worms") coming out of cracks between the floor and wall of my upstairs master bath shower. Even a few about an inch up in a wall crack. So I need to treat that area as well as the drain. Will the hot spot foam along with the gel in the drain work for this problem? I was told to put a dehumidifier in for a week to totally dry out the tile area before regrouting. Should I do this before or after treatment?


The Invade Hot Spot should do a great job eliminating the drain fly larvae in the areas you mentioned. We recommend that you eliminate all of the larvae before grouting to avoid any issues.

Answer last updated on: 11/07/2011

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