Your plant will absorb nutrients best when ppm levels coincide with the size. When you have a seedling you want to keep the ppm's at low 3-500. This would be the first two weeks of nutrients. On the 21st day of growth you should boost your ppms higher to about 8-1200 like your mate said. Keep them their until after a month of 12/12. Then you can go up to 12-1500 because at this point your root zone should be large enough. The last two weeks before flush you can even push your ppms up to 18-2000. At this stage your babies are so far into maturing your plant won't die, just absorb nutes and grow fat trichs. I really don't think you should push your ppms that high if you havn't got much experience. Hope I answered your question.

Plant size = ppm levels
small plant - low ppms
large plant - higher ppms
SCIENTIXT Reviewed by SCIENTIXT on . ppm level s 1 thing im confused with is ppm level s , my m8 a the shop said between 300 , 4 seedling , and 1500 , 2, 1800 , 4 flowering around week 5 , but i read in a book 2 all way s keep it between 800 ,2, 1200 , im lost .............:thumbsup: Rating: 5