After a few emails back and forth I was asked to call customer service. I spoke to the man who had emailed me, he repeated that this was not hazardous, that the bacteria die off and it becomes less effective after mixing (on the phone he said 8 hours, label says 12 hours), so it "was essentially water" and I could just pour it out, though he did not recommend pouring it down the drain. Best thing to do was to spray it on plants, he said it would not hurt them. Since I have bean leaf beetles now, and saw thread where digdirt recommended Bt for the larvae, I added more Bt (I had mixed it initially at 2 tsp/gal concentration a week ago) and sprayed the beans and edamame. The original mixture may have been inert, but I think it went anaerobic sitting in sealed jug for a week b/c it certainly did stink! Didn't clog my sprayer though. Recommendation was to trash the mixing/storage container(s) and not recycle them, even after rinsing (but I could have guessed that). No waiting for hazardous waste disposal day at transfer station. I have a little left I think I will inject into my squash plants again since I was "inoculating" the stems, and I am now seeing some holes and possible frass at the base of *leaves* so SVB must have just hit the tops of the plants and didn't make it to the ground on most of them. BTW, SVB season should be over with here in southern New England, right? Though I am seeing new SB eggs - and some nymphs from eggs I missed. Found the duct tape though (and sprayed insecticidal soap on eggs and nymphs last night). Also planted some more squash seeds.

kimmsr , your first comment is applicable to an array of "products". I start off by stating that there is a carcinogenic product in the water I drink; but it goes undetected because either there is no test for it or, it is there in such minute amounts that instruments in common use cannot yet detect its presence. And there seems to be no scientist who has a 'gut feeling' and / or the intestinal fortitude and / or the moral conviction to take a stand. Ever so rarely there is a Dr. Frances Kelsey on whom I have affectionately conferred the title "Mother of the American Nation".

Bacillus thuringiensis will aid in controlling some insect larva if applied early enough in the larvas life. BTK, one form, is meant for leaf eaters and when they are young will give them a disease that causes the wee buggers to stop eating and so they die. BTI, another form, is aimed at the larva of blackflies, fungus gnats, and mosquitoes. BTSD, still another form, is aime at some weevils, the Colorado Potato Beetle and elm leaf beetles. What you have might be a powder, meant to be mixed with water, or a dust meant to be applied to the plants the target insects feed on since it must be ingested (eaten) to work. If the container does not have application directions on it you were not given anything useful since you cannot use it because you do not know what it is and whether it is a powder or dust.

Bt only works if caterpillars ingest it. Spraying needs to coincide with bud development and should only be directed to the buds. Bt has no effect whatsoever on eggs or adult moths, and should not be applied to the soil. Call your local extension office to find out what the recommendations are for timing in your area. It will vary greatly from location to location, depending upon climate and weather conditions.