A lot of people also call this the salts number. In reality we measure the conductivity of the urine. And yes, that is for the most part determined by the amount of salts. There are about 48 types of salts that can be present in the urine, and all of them conduct electricity and can therefore be measured.
RBTI is about the whole equation and not about one certain number. The difficult part is how they all interact. But the one that is the easiest to understand for most people is the conductivity.
Let’s try to explain it simple: all cells are connected to a nerve. That nerve passes a electrical signal with instructions from the brain that tells it what to do. If the conductivity is too low, the signal is not getting through well enough and the cells do not get all the instructions. If conductivity is too high not only the cells that the instruction was meant for get the message loud and clear, but the cells next to it get the signal also, perhaps even other organs. Besides that, high salts and cholesterol problems go hand in hand.