It takes awhile because of the toxic salt that the plants give off. When I put in fresh rez it looks like purple, brown kind of. ( lucas formula ). And when I take it out in 10 to 14 days it looks just like piss yellow and almost has the same TDS. I only top up with RO water. I use more nitro to veg with too. I have small rez's but maybe a big one can go alot longer.
LOC NAR1958 Reviewed by LOC NAR1958 on . The Lucas Formula I have noticed a few threads where the Lucas formula was mentioned. Here's a link that will explain it's origin. http://www.angelfire.com/cantina/fourtwenty/articles/profiles.htm By the by it does work, is less expensive and saves time. Hope this will help. Rating: 5