Electrolyzer = This instrument has positive and negative two-electrode rods (one is an iron rod and the other is an aluminum rod), that is, two electrodes introduced as an electric field. After the electrolyzer is energized, under the action of current, the positive valence Fe3+ ions are dissolved, and they will combine with the negative OH- ions in the water to form water-insoluble Fe(OH)3 particles, which are colloidal particles in the water. The coagulation and adsorption activities are very strong, and thus the adsorption and agglomeration processes of organic or inorganic substances in water are formed. At the same time, due to the action of current, the metal particles originally dissolved in water, such as manganese, potassium, etc. are reduced and gradually aggregate to form a metal cluster. Digital LCD TDS Meter = A TDS meter is a small hand-held device used to indicate the Total Dissolved Solids in a solution, usually water. Since dissolved ionized solids, such as salts and minerals, increase the conductivity of a solution, a TDS meter measures the conductivity of the solution and estimates the TDS from that reading.