I snagged this from another thread.i just had this problem in my hydro system, i had many root aphids attack and the product that did it for me was sm-90. that product is amazing, i just started a thread a few weeks ago about it. It say on the bottle to use 2-3ml per gallon but i called nutrilife and they said i could use up to 8 mil per gallon and i did. It took a few days but after a week, all the larvae and adults were dead. It put no stress onmy plants and worked amazing!