Oyyy! ...even as an estimate, it's clearly waaaay too acidic in there...it explains the defc.'s too,...but I puzzle as to how it became so far off; hmm, not having ready access to RO/Di water is a pain,... and if you want to stay with coco, you'll need to get a small RO unit, like something for the aquarium fish hobby (I have one, small 24GPD output),... As I mentioned, coco is a different gig from soil, even the recommended flushing methods are different... it all ties to the unique CEC coco has, and the need for extra Ca in particular (homework for you!); the coco has a strong affinity for it, so it must be sated first, or the plant gets shorted, basically... Okay, here's what one source says about it: flushing soln. should be RO/DI water, pH to 6.0, with 150ppm of Ca-Mg + 150ppm of nutrients; check run-off ppm frequently, and stop when it's coming at at or near 300ppm/6.0 pH... So, what to do for you... a flush is needed for sure; what's the pH of your tap water? ...guess you'll have to improvise! You'll need at least 2x the volume of your pot, and should add 1/2 strength Ca-Mg to it, and about 20% strength of nutes,...test the pH after it all sits for a while, then start the flushing...test pH of run-off half way through and see what's happening,... around 6.0 is where you want to end up,... I'll ask other UK'ers about the Accurate 8... odd, that's it's not available over there,..
