No don't do this under any circumstances. I've been using autopots a long while now. I've emailed different nutrient companies and autopot themselves. They all say the same shit. Never water from the top down once the system is activated. Do this pushes all the crap down to the roots. I know from experience. If you want to flush in an autopot then fill the res with plain water and that's it. To be honest flushing at the end of a grow isn't really needed, the flush products are good for autopot at the end.I will add that it’s important to remember plants don’t drink everything you give them, they just take what they need and leave the rest in the soil/nutrient solution. If you are giving them even a little more than they are using but not flushing it out of the pots then even at levels that seem low nutrient salts will still be building up in the soil. This is why you need to take them off the system every few weeks and give them a good top down watering of mild nutrients so that any built up of nutrient salts will be removed.