I have never used a ppm meter due to their cost but I change my nutes out once a week when plants are blooming especially that way everything stays fairly constant. Has always worked for me.
SAP420 Reviewed by SAP420 on . any ideas with this ok ive been reading and reading on here and its been very informative. But i think i need to give all my info for a proper response from you guys so here goes....5x4 room with mylar on walls. 600 hps. flood and drain. 4' of space from light to flood table temps are 77 to 80 with light on and 70 with light off. rez temps are 70. 3x3 flood table with 18 gal rez.osilating tower fan and a good 400 cfm exaust fan running the aircooled light. using floranova grow and bloom for veg and bloom. in the Rating: 5