Run-off readings higher than input: what to do? Should I flush the soil? Plant looks fine and healthy...

@MadeInGermany no real reason :) Both the soil and the fertilizers were on discount in the shop I bought them from, and I went for them :) Being my first grow, I'm learning quite a lot - at least I hope - and for the future I might try to be more careful in choosing my setup.

A question :-) why do you use organic soil but mineral fertilizer? So you can do that, why are you doing it?

To further elaborate.. I have a lady in plain old Potting mix and she has had zero nutrient in waterings and she is loving it. Your run off comes in too play if you think your soil has no nutrients or is causing you problems.. Run off readings are important in Coco because it gives coco growers an idea of what is happening in the root zone. Cannabis has been growing in soil for millions of years and tends to grow very well in it. Unless you have very low nutrient content or very high nutrient content. Cannabis likes balance.

Stop getting run off readings from soil... You get run off readings in soil when you think you have a problem.. What you are seeing is you stripping the nutrients out of the soil.... That's why the ph is going down and the ec up.... I can help you grow in soil if you like but it is very different then growing in coco.