Hello! The pH level depends on the medium you're growing in, if you're growing in coco you should adjust it to 5.5-5.8 during the vegetative stage and 6.0-6.3 during the flowering stage. If you're growing in soil it should be between 6.0-7.0 during the whole cycle. The PPM should be approximately 100-250 for seedlings, 300-400 in the first half of veg, 450-700 in the second half of veg, 750-950 in the first half of flowering, 1000-1600 in the second half of flowering and 0 when flushing.