Why are you flushing every third watering? You risk flushing out the buffer that has been created and increasing potassium levels leading to further problems with magnesium def etc. Why dramatically change the EC zone at the root ball? If you are draining to waste, there is no salt buildup as...
Interesting that a lot of the farmers here like long flushes in coco - 2 to 3 weeks it seems.
I was under the impression that one of the benefits of coco is that you can get away with a 5 - 7 day flush and that a 2 week flush leads to a loss of potency and yield.
Coco simply doesn't hold...