Retired to watch the grass grow.
AFN Global Moderator
I do not find the plants get stressed by my method. The PH is always in range 5.6 to 6.2. Letting it wander will allow the different nutrient to pass through their sweet spot. Letting the PPMs cycle does not hurt them either as long as they are getting enough.I've heard that varying nutrient solutions and ph levels can stress the plant. Unless this is just with coco coir. I test my runoff to see exactly how much ppm my plants are eating then adjust it to keep the ppm in the root zone a little above what their eating to keep them in the sweet spot and not overwhelm them with excess nutrients. This is what I did in my coco grows. I know there's gonna be a learning curve with rockwool and expect setbacks and problems. You said you do drip to waste When you say drip do you mean actually drip or a controlled 250-500ml shot of feeding solution ?
Using run-off for anything is a bad idea. I have had run-off readings as high as 2000PPMs when in the root zone it was 500PPM Just worry about what you put in.
Yes I have drippers 1 GPH pressure compensating so that each plant gets nearly identical fertigation amounts. It is not perfect but very close.