A traditional chlorine donor in granular form that is totally soluble and contains stabiliser to minimise chlorine loss to sunlight. This is particularly valuable when the spa is located outdoors. Chlorinated Concentrate granules have a pH value close to neutral so they will have little effect on pH value when added to your spa. Maintain chlorine levels between 3-5mg/l at all times with regular shocking using Spa Lite in order to maintain effective sanitisation of your spa.