PH-Minus Liquid Professional is a highly concentrated acidic liquid specially adapted for continuous treatment by means of a dosing pump. It effectively reduces high pH values. PH-Minus Liquid Professional consists of 40 % concentrated sulphuric acid. Thanks to its acidic properties, pH-Minus Liquid Professional works effectively at high pH levels and quickly returns to the ideal pH level. Dosing is carried out using an automatic dosing unit (Pool Relax®, PoolManager®, Automatic pH, Automatic Cl/pH), or by means of a separate dosing pump. Injected into the hydraulic system continuously and as required, it maintains the pH in its equilibrium range (7.0-7.4). pH-Minus Liquid Professional is compatible with all treatments (chlorine, bromine, active oxygen...), all filtration systems (diatomaceous earth, cartridges, sand...) and all coatings (liner, tiles, silicone marble, polyester).