Have you been pre-conditioning your rockwool cubes? They are not pH stable right from the factory and should be soaked in pH'd water or a commercial RW conditioning solution before use. The pH WILL go high if you don't. Same deal with hydroton pellets. Gotta pre-soak.
stinkyattic Reviewed by stinkyattic on . BIG PROBLEM I have grown with 100 percent success for a few years this time my clones took a long time to root and they have been put in the 4 inch cubes now and they don,t look good I am on well water and used the same rooting stuff the girls in the flower room look great so far My nute meter showed that the just water went up from 44 to 70 the max on my meter is around 220 this is the only thing i can see that could cause the prob And my mother has gone into preflower WHY thanks for any help Rating: 5