Hi @RobRoy, I did try CG-50. Over here:
But, it was more of a lab bench / comparing against conventional buffering. So, a specific amount of CG-50 was added to a test formulation and then titrated against buffering capacity. Wasn’t tested on a live grow system but the intent was to show that you could while comparing different buffers. In real life, you’d put it into a filter bag of some sort and place it into your reservior.
Summary on CG-50 is: It works, it’s fairly slow, it’s pricey, but it’s reusable.
The torus hydro is essentially the same thing but packaged for use in a hydro system. This looks nice. Coincidentally, it seemed to have been released around the same time we were testing the resins.
PH Perfect (advanced nutrients), as an example is probably using something similar to a weak MES buffer. We had also tested MES in the above thread. It is, perhaps, the best traditional buffer for this application but it is also relatively pricey. Capable of even more apparent buffer capacity than the CG-50 resin but it’s disposable.