AquaSPArkle Scaleaway will prevent and remove scale deposits caused by mineral precipitation which can build up rapidly on spa surfaces due to the relatively high water temperatures. When water is heated there is a tendency for the calcium carbonate in the water to form scale on metal surfaces such as the heater element, pipework and jets. If allowed to build up this scale will severely affect the performance of your spa. To stop the calcium carbonate from being deposited in this way scale control products keep the calcium 'in solution' in your spa water. Apply the product directly into the spa water whilst the pumps are running. Spas treated for heavy scale will require the filter cartridges to be cleaned a week after treatment. Initial application: 25ml / per 1000 litres of spa water. Maintenance dose: To maintain the effect, add weekly at the rate of 15ml per 1000 litres of Spa water. Supplied in a 1Lt bottle.