Alimentazione minerale in cocco

it takes very little effort to get the soilless substrate to "reset" for lack of better vocabulary. Not as fast as a reservoir change for hydro, but only a couple irrigations with extra runoff will do it, or close enough that you can simply do regular runoff after that and the last few percent will average out quickly enough. You have excellent drainage qualities. so even if you did 20-30% runoff (waste) it shouldn't even make the foliage droop. The extra runoff will quickly shift the substrate to new formula. I'd wager just 2 irrigations with such runoff would be enough. Go back to 10% runoff after that. with the extra volume of water, whatever that 20% light mix added is diminished to near zero at that point. in future, if you go soilless, go 100% soilless. provide a full diet from fertilizer and get 10% runoff religiously. it's just easier than trying to straddle fence with soil additives and then ramping up fertilization to what you would be providing anyway had you not put anything but perlite in with the coco etc. or.. go with amended soil that feeds a long time... trying to do both gets none of the primary avantages from either method.