There are three types of chlorine for pools: liquid chlorine, solid chlorine, and shock.
Liquid chlorine is a powdered form of chlorine dissolved in water to make chlorine gas. It is the most common type of chlorine used in swimming pools.
Solid chlorine, also known as calcium hypochlorite, is a tablet or pellet form of chlorine that is used to chlorinate swimming pools and spas. It comes in two forms: slow dissolving and fast dissolving.
A shock is a high-strength form of bleach used to kill algae and bacteria in swimming pools. It can be used to chlorinate the pool or added directly to the water.
Where to buy it?
Liquid chlorine, solid chlorine, and shock can all be purchased from pool supply stores. You can also purchase liquid chlorine and shock online. However, solid chlorine is not always available for purchase online.