I have been fighting what appears to be total nute lockout for about three weeks. The clones were initially healthy until transplanted into hydroponic room. The initial ppm's for nutes were 400, pH corrected from 7.2 to 5.6-5.8. Watering with Multipure under sink filtration unit. Within approximately 3 days the yellow/white was becoming apparent. Did all the usual stuff to correct, (reservoir changes, flushing, ect.) with no improvement. Pulled them out of hydro put them into soil and now I'm praying. Had some plants in soil which were doing great. Started to water these with the same Multipure water (still in soil) and in three-four days they began showing the same color changes and stress reactions as the original group. Multipure filters use compressed carbon blocks to filter the water. Has anyone had or heard of filtered water causing this problem before??