Growth Tech Optimum 1 Liter BLOOM Part A+B .Optimum is precisely formulated nutrient formulation designed for use in all systems ,best results use perlite and expanded clay.For coco fiber use GT coco from Growth Technology .
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I have given this product 4 stars because I am more than happy with its performance over many years. I can honestly say I find it the best of the products I have tried. I would also like to thank Hydro World for their excellent sales and service since I have been a customer of theirs.