Underground
New Member
Hello, I have 13 plants running on a top drip system with a 18 Gallon resevoir (first off, is that a problem? should I have more than 18 gallons?). I bought a new meter that has Ph, PPM, and all that other stuff. My PPM was 330 yesterday, and today it is down to 320. Which means I need to add more nutrients? ( i think that means that) My plants have been veggin' for a month, and they seem like they are doing Fantastic !... but I've been reading about PPM being around 700 - 1200. Is it based by strain? I was reading that when my PPM doesnt drop everyday...that I have the correct amount of nutrients..I dont wanna add nutrients though and burn my plants...what should I do? Does anyone know of a thread on here talking about PPM, or another link concerning PPM for newbies?