I use Gh weekly feeding program,3Part grow,flora micro,florobloom,diamond nectar and Koolbloom.You can go to Gh web site and down load a feeding program to the gals. of water in your res.and adjust it to your needs.If you are useing RO water add calmag plus you will need it to replace calcium,magnesium,and iron the Ro water dosent have.This works great for me and my ebb flow system.Peace