The active ingredients of PureSan Pro solution form a precipitate as they react with bacteria, algae and dissolved solids etc., and therefore become used up. Dosing should be carried out in such manner as to achieve optimum residual levels of active ingredients once the initial precipitation reaction has taken place. The maximum copper and silver ions concentrations of 1.00mg/l and/or 0.05mg/irrespectively should not be exceeded. The dosage of this ionic solution needs to be properly assessed, designed and maintained as part of an overall water treatment programme.