end of harvest flush? 3-5 days? if canopy is damaged in anyway, do 2-3.
the concepts of flushing are misrepresented... it won't impact taste. it won't change the color of your ash, lol. this is only an iff... maybe, it's good in cases of toxicities, but not due to those factors listed or the common ones peopel use... people ar ehorrible at science.. you hear things like 'the plant selectiveyl absorbes what it needs" BWAHAHA that's not what roots do.. at best a selectively permeable membrane that is wholey caused by physical shape and size of pores/holes whatver the proper vocab is... porocity?
so, don't fret. if you want to flush in coco, keep it short. you will ssee deficiencies within 1-3 days start to spread, unlike soil which can take longer.