No RO, a healthy organic mix will adjust the PH, runoff is not an accurate indicator especially with the pre loaded amendments. organic mixes can absorb and hold a lot of water, getting air to the root zone could be an issue if you have a heavily amended organic soil with excessive moisture sitting, it can become anaerobic killing off the biology that is "digesting" your preloaded amendments, without the biology firing those amendments will just sit in the soil. If you are using amendments that are milled very fine and soluble its a good idea to flush your mix before transplanting, soil sucks up and holds that initial moisture along with whats in it and it cannot be rinsed out as easily as coco or peat based mixes. A nutrient rich low O2 environment can lead to various issues quickly, weak growth, degrees of lockout, struggling plants, weak root systems, and multiple random issues rather than one clear issue much easier to trouble shoot. Using breathable containers may help, fabric pots tend to work well with Organic soil even if you have to go up a size to do it. For now dry out your mix, re-introduce the biology, feed only water or mild teas with focus on catalysts that assists in breaking down your amendments and biology rather than adding any more nutrients. Next run try fluffing your mix with red rock or perilite to increase the O2, reduce or eliminate the preloaded nutes, (remember organics already contain the major building blocks and are not 100% dependent on you adding nutrition, peat and coco are practically sterile) when you feed consider starting at 1/4 to 1/2 of what most manufacturers recommend, you can always increase it. slightly moist to almost dry between waterings. Remember you can easily over feed and over water organics, the mix holds more moisture longer especially if the mix contains a large percentage of material of larger grade than coco or peat, those can take weeks to dry out and much of that is based on how fast the plant is taking it up and transpiring, evaporation does not assist nearly as much as it would with greenhouse or outdoor. Organics are the pratice of managing an ecosystem, you are not feeding the plant, your organic soil is, all you need to do is provide the building blocks, be gentile.
