I observed hundreds of this small insect outside and inside my laundry room on the ground level. They appear to be coming from a floor drain in the laundry room (more detail below).
I am confused because they do not appear to be drain flies. Here are photos:
More pics in this Imgur Library
They have transparent wings that they seem to quickly drop (and leave everywhere). They are long and skinny.
- I live in a townhouse on a concrete slab. The laundry room is on the bottom level directly on the slab.
- There is a 2.5" PVC drain opening in the laundry room floor that runs below the slab. It is completely uncovered. I don't know how it's routed from there.
- The purpose of the floor drain is to allow A/C condensate + emergency overflow from the water heater pan into the drain. There are two 3/4" PVC pipes just stuck into the 2.5% PVC "hole in the floor" and that's it.
Here's what I've tried so far:
- (Twice:) Baking soda and vinegar down the drain
- Wait 24 hours, boiling water down the drain
- Wait 24 hours, hose water down the drain for several minutes to try to flush everything out
Today there were hundreds more, and when I shine a light down the drain it looks nasty again. Two questions:
- What kind of insect are these? I think knowing this may help me if I need to hire outside help.
- How can I get rid of these? I was looking at maybe getting some commercial enzyme cleaner on Amazon to try to dislodge whatever matter might be in the drain that they are feeding on. I do also have a drain snake. Open to any suggestions.