Each system is different I don't doubt that it's possible to not flush however common sense tells me it's not ideal.Well for now I’ve flushed each pot with 10 gallons of ro water with FloraKleen. My ro systems and shop vac got a workout. I’ve reduced ppm in the res to ~400. I don’t have a water softener and I use a ro/di unit to make my water. While I don’t doubt and I’m beginning to learn that bottom feeding coco can be tricky. The forums are full of success stories using the same exact media that I’m using in the same exact system without flushing until the last week of their lives. Root rot could potentially be an issue but I am using about 2 inches of clay pellets in the bottom in conjunction with air domes constantly blowing air over the roots so I feel pretty confident that it’s not an issue. I really have no way to check it anyway until the plant is gone past the point of no return and I pull the whole pot from the tent. I’ve heard pho’s deficiency and that was the first thing that I concluded when all this began but then I got to thinking... would they even really show a P deficiency in veg? Anyway thanks for the advice guys I’ll keep ya all posted on how they are doing in a few days. Oh one last thing, should I remove some of those extra brown and crispy leaves or just them fall off on their own?
The need to flush and frequency will be largely impacted by the nutrients used and the concentrations it's fed at.
Feeding is not something you can just go by a schedule unless you are running the exact same environment, lights (model, intensity height, bulb etc.), humidity, temps day/night, medium and a clone of the same plant it was developed on.
Less is always easier to fix than more. Flushing is just good practice and eliminates possible issues in the future. Just because it can be done does not mean it's ideal. Hell I even top flush my RDWC plants once a week just to clear the hydroton of any build up. I don't think many bother and have no issues but it's one less thing for me to worry about and take 1 min.
Just a few things I've learned along the way.