Fi-Clor Spa Alkalinity Increaser should be used to raise the total alkalinity level in spa water.
Alkalinity is a measure of the total amount of alkali in spa water. If the alkalinity is too low, most chemicals added to the spa will directly affect the water balance leading to rapid fluctuations in pH readings.
Alkalinity at the correct level will help protect, or "buffer" the pH.
Fi-Clor Spa Alkalinity Increaser
Delivery cost is £3.50 per order. Orders received before 1pm will aim to be delivered next day although this is not guaranteed. (Some locations are an additional delivery charge, you can check this here).