The original 3-part advanced nutrient system for hydroponics, Coco and soil. 3-part “Building Block” nutrient system: GHE Flora Series gives the best possible balance between concentration and flexibility. FloraSeries was developed to a NASA brief: make the most concentrated + flexible nutrient possible: Not green enough? Use more of the green one. Too green? Use less green and more pink. 30 years of tweaks and improvements later AutoPot is recommending FloraSeries because it gives super reliable, extremely effective results in their systems due to the high quality formulation and ingredients. The link is both these organisations really know what they are doing, and they choose FloraSeries by GHE. Are you used to A and B + CalMag + PK + Oligo Elements? Try A, B and C instead, thousands of professional growers have, and wouldn’t go back to 2 part + extras. FloraMicro® Available in Hard or Soft water composition, FloraMicro is the foundation of the “building - block” system, providing micro and sub-micro nutrients and some complementary macronutrients. FloraMicro is available in both hard water and soft water versions for optimal results even in RO water. Use as directed all the way through growth and bloom.