Blue Horizons Total Alkalinity Reducer (inhibited hydrochloric acid)
It should be dosed at a single spot in the deep end with the circulation turned off.
Swimco Price £16.00
After one hour switch on the circulation and allow the water to mix thoroughly. Test and repeat if necessary. If the total alkalinity is above 150ppm, it may result in cloudy water or scale on the pool surface. It can also make pH adjustment difficult.