I believe that the GH nutrients have no pH buffers. When using DWC or Aero system it is better to invest a little more money in the nutrients. The best nutrient to use would be the Canna Aqua series.
Mix the nutrients let it stand for one hour so that the pH buffers in the nutrient solution can activate, then adjust the pH down to 5.8 (if necessary). Once you have done this then your nutrient will remain stable between 5.2 and 6. Besides the Canna Aqua having the pH buffers it also contains fulvic and humic acids which helps with nutrient absorption.
Root rot will cause your pH to drop, the greater the root mass and the greater the rot problem the lower the pH will be. This will also hurt the root system even more thus making the root rot even worse. If you have a root rot problem and you are using a DWC or even and Aero system the product to cure the root rot is Flora Shield. We have had great results with this product. Mix the Flora Shield into a spray bottle (10ml/quart) and spray the roots directly. Make sure to drench the root system with this spray mix. Then flush for one day, dump the flush, and make a new nutrient mix. Repeat once a week if needed. Results are normally seen within 24-48 hours.
Last edited by dhill; 06-07-2006 at 03:55 PM.
BGH Grow Expert