I use to use hydgrozyme till I compared the product Quantum growth against it. Quantum is cheaper and does the same if not more than hydgrozyme. We ran a side by side test in 5 gallon buckets with the same strain and nutes the only difference in the two were Quantum and hydgrozyme. The hydgrozyme plant was about four inches taller and the root ball about eight inches longer but the plant with the Quantum Growth added to it was much greener in color and had alot more thickness to the stem. It seemed to be alot busher than the Hydgrozyme. The root ball size was not as long but alot bigger in size or mass. The yield didn't compare we had close to two oz. more dried product off the quantum plant than the Hydgrozyme plant.. I have been a user of Quantum Growth since that day. I have saved on nutes and preach about microbial products constantly. I located the product from a distributor in fl. Douglas Speed and Associates, check out their web site, great customer service know their products. The microbes in Quantum convert all the nutrients for the plant ten times faster than the plant can itself. The plant doesn't have to work as hard to convert and spends that extra energy growing and producing yield. Not that Hydgrozyme is a bad product, there is just better and cheaper products on the market today. Indoorman preaching the microbes.