but mine seems to be gone after just two days. I don't remember where i read it but some one mentioned Bounce dryer sheets around the base of the plant. I figured what the hell. my wife buys them in boxes of 100. Believe it or not, it's working. Didn't see not one gnat in my flower room this evening, and i looked through all six plants (White Widdow-1 soil, 1 hydro) (White Rino-1 soil, 2 hydro) (bag seed-1 soil). My veg area didn't have any when i looked earlier today. It really didn't dawn on me since they are pretty much outside. My mother plants (WW, WR, bag seed) are all inside in a closet grow (soil). Had the damn things in there. I didn't pay any attention to them either until i noticed my flwr room was gnat free. Went to take a look in the closet, ruffed up the soil and didn't see a thing. I don't know how or what it does but it worked.