Heya Twelve. I am dealing with thrips right now. I have a combination attack going:
First, Mosquito dunks in my reservoirs - safe, non toxic, supposed to be really effective on killing larva for thrips and fungus gnats. I put it in a nylon sock with a rock in it to keep chunks out of res., the rock lets it sink to bottom. I put 1/2 dunk in clean water res, and half in my active res. I've seen no ill effects to plants, or PH, etc.
Second, sprayed everything well with SMS 203, and will do second treatment in a few days.
Third, installed hot shot pest strip - seems safe enough, and also supposed to be very effective.
Fourth, I sprayed "home defense max" around perimeter of grow room, and entrance to, etc.
SNS also has a systemic product (209?) that helps the plant build a protective layer/coating that thrips don't like, but it takes time and is more of a preventative not a fix for existing infestation/prob.
I have to thank Mr Smith and Bassman for the tips - I went thermonuclear on those mofos.