We use a “Natural” Purifier in the spa. Is this sufficient?
NO IT IS NOT. These silver or copper based purifiers act as an algaecide in the water. They assist the sanitiser (chlorine or bromine etc.) but cannot replace it. The law stipulates that a sanitiser MUST be measurable and have a residue in the water so that any bacteria can be immediately killed. These purifiers do not comply and do not guarantee that the water is completely safe to swim in.