there is a popular formula method for the GH flora series(lucas formula)that advocates a reservoir change after a equal amount of water has been added back,from what i've read it's a very effective method and produces good result's,i havent tried it yet,but i plan to in the near future,i have a 30 gal res that i replemish every 2 week's with added nutes and a 50%water change and my set-up is thriving very well,but since i'm a minimalist it works out well.there well never be a perfect balance of nute uptake,the plant is selective so it will use only what it needs,but it will end up using most of everything.just my suggestion,but get input from others,then decide for yourself,chances are you'll make the right choice's....good luck to you WM. bonbon
bonbon Reviewed by bonbon on . Nutrients and yield :cool: Howdy Fellow Farmers!!!I use General Hydroponics Flora Series, according to the GH chart...I noticed the ppm concentration decreases rapidly, to about 50% starting strength in 7 days...and then I change it... I also now see a group of additives listed on their chart, Diamond Necter/Chi/Flora Shield/prysol, etc.... My question is, "Are these additives cost effective", ie., are they worth the added expense??? Furthermore, are there other less expensive nutrients to use yielding the Rating: 5