Relax Chlorine Multi Pool Tablets 5kg 440+ Turkey Snorkeling Woman Only Stock Photos, Pictures & Royalty Free. An excellent slow dissolving tablet that is made from stabilised chlorine granules. These tablets also include an algaecide in the form of copper sulphate, and a flocculant excellent for dealing with algae in a pool, and keeping your filter working well. These tablets contain cyanuric compounds and are acidic so please adjust the pH, calcium hardness and total alkalinity levels of your pool water when using these. In pools where these are used regularly you need to watch the build up of cyanurates control these levels by adding fresh water after a backwash, and monitor them regularly with test strips or tablets.