The odor of a smelly shower drain can be eliminated by removing debris from the drain. Discarding the odor-causing material in the garbage outside the home ensures the smell does not invade other areas. Boiling water dissolves oils and grease deposited on the sides of the pipe in the drain, which add to the smell.
Luckily for us, Nernst derived an equation that allows us to determine at what point the two forces (chemical and electrical gradients) balance each other - in other words, at what point we have an ionic equilibrium.
When the electrode is placed in a saturated potassium chloride solution it develops a potential of 199 mV vs. SHE. The potential of the half-cell reaction shown in equation is determined by the chloride concentration of the solution, as defined by the Nernst equation.