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Mspa has applied the PTC (Positive Temperature Coeficient) technology to all of their spa products, the new ceramic heaters heat your water quicker, will save on electricity consumption and are housed in a tripple-insulation heating device. A black dot on the base of the tube is lowered until it is no longer visible, at which point the result can be measured using the scale on the tube. Check bromine levels regularly with a Test Kit and maintain a bromine residual of 2. As an indication, 1 tablet will increase the stabiliser level by 10mg/l in 5,000 gallons of water (22,700 litres).