Some PGRs are nasty, like this stuff. Others, like the triacontanol found in alfalfa, are just fine. Know your nutes!!
Why not use dry nutrient salts and save yourself a fortune?
Example; instead of Clearex, I use 2 dry grams per gallon each of table sugar and epsom salts dissolved in hot water before adding and pH the system to 6.0 I recommend that growers never flush plants in inert materials (dwc, hydroton, coco, etc) with RO water, as it reverses the osmotic balance of the root system and interferes with the plants' ability to metabolize properly. The idea is to use up the residual nutrients in the plant by giving it free energy (sugar) in a mild solution (epsom salt) to soak it up with. The sulphur may contribute to flavor, too.
My flavors get a lot of positive comments and it smokes very smoothly even before a cure, so I can't be screwing it up too badly.