First let me say that in the earlier stages of bloom you might want to water for 15 min every 3 hours. As they take in more water u should boost water to 15 min. every 1-2 hours. As for your tds issue, you should take note of your total disoved solids before u mix nutrient maybe your water is hard to begin with. I will say that I personally run mine at 1200ppm once 2 weeks into bloom.:thumbsup: