Quote Originally Posted by disrupt86
A general guideline for TDS levels is as follows: seedlings = 50-150 ppm; unrooted clones = 100-350 ppm; small plants = 400-800 ppm; large plants = 900-1800 ppm; last week of flowering = taper off to plain water.
this is just a general guide.you need to take into account your waters current ppm before you ad anything.my ppm in my town is horrible.its a solid 600 and a beotch to work with.hope this helps a little

well i'm @ the upper end for small plants. these are all rooted clones, the big one has like 30+ roots and atleast 15 of them are 2 ft long!

the ppm of my RO water is 9-13 so no worries there. my thought is that maybe because of the root complex(Root 66) their ability to uptake nutes has been increased and therefore need lees nutes?

i'm pretty lost actually. i don't know if my plants need something, or if i should be adding PH balanced fresh RO water to lower PPM

please help!