It can be soil you purchased. Many times bags with soil sit under the rain (in stores) and aphids lay eggs in it. Once they infect the soil, they reproduce quite quickly (as fast as 6 days). You need to treat soil. Start with letting it dry so the larvae dies. The other things you used will kill adult aphids, but not larvae. Plant garlic in these pots. Peroxide diluted with water kills larvae, but it is to expensive to use on multiple pots.
Wish you luck with it.
__________________
Ella
God comes along and says, "I think I'm going to create THE tomato!” 
Last edited by efisakov; March 9, 2018 at 05:45 AM.
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