Update: Week 8 Day 56
Just a few days to go, may harvest a couple of them this weekend, then the rest on day 63.
Day 6 of flush, began adding RO and just Drip Clean, 0.6 ml daily @ 3 gallons per day. Each days last of 4 irrigation cycles get whatever is remaining in the rez (approx. 0.5 to 1 gallon) and I refill with RO and Drip Clean. EC of today's solution is < 0.014 and rinsate is also < 0.1 so by the time I harvest I expect somewhere around 0.01, pH of the rinsate is a very steady 5.8 to 5.82.
I know the reason for the curled and burnt leaf tips, little flushing during the grow and the EC is off the scale. I believe this is due to lack of runoff during the cycles and the KoolBloom, both liquid and dry. Prior to adding them there was no build up in the root zone and I got away from my normal 400 ppm of Canna A&B, increase to 600 ppm prior to adding remainder of additives, around 1.2 EC. The EC then jumps to > 1.4 - 1.5 when adding the additives and dry KoolBloom. Will be working on this in future grows.