I've seen some references lately to Redsea Alk Pro, Ca Pro, and Mg Pro kits in silver boxes, and have seen descriptions for refill kits which say they for test kits in silver boxes only.
Are these silver-boxed kits newer and/or better than the "Pro" kits in black boxes?
Are these silver-boxed kits newer and/or better than the "Pro" kits in black boxes?


