tumescent85
Member
I was hanging two lights. Now I have one. Center of plant and top of colas are now at 700 - 900 ppfd according to an app, however accurate that may be. I have considered ph and therefore ordered a blulabs ph meter. I use a bluelabs tds meter for ppm. She gets a new res every three days because she drinks the whole thing that fast. I feed at 5.7 - 5.9. Ph in dwc fluctuates within hours and is impossible to maintain regularly. I assume that is because as the plant eats the tds decreases resulting in a higher ph.i have a couple questions what are you using to check your ph, how often do you calibrate your instrument? how often do you check the ph of your reservoir ? also what instrument are you using to measure your ppfd, 1100ppfd is pushing them pretty hard without co2