The pots seem to hold up well they also help insulate. The injectors do have numbers on the bottom for adjusting. Verti-Gro gave me the intial setting for the injectors using the
nutrient mix I was using and they were right on tho you could tweak it by testing the
nutrients with a meter. Not sure about the cost of just the injectors I bought the whole board already built and it was around 1500 but these are the larger injectors they do make smaller ones.