Fi-Clor Spa Hardness Increaser should be used to raise the calcium hardness level in spa and hot tub water. Calcium hardness is the amount of dissolved calcium and magnesium in pool water. If there is insufficient dissolved calcium, it will be difficult to balance the water - there could also be grout loss in tiled spas. High levels are not a major cause for concern provided the pH and alkalinity are within recommended parameters, but the reading should be kept below 750mg/l (ppm) if possible.
DO NOT MIX WITH OTHER PRODUCTS. DO NOT DISSOLVE BEFORE USE.
1. Take a calcium hardness reading using your test kit or test strips. You will need to correct the calcium hardness if the reading is below 175mg/l (ppm) in acrylic spas or 250mg/l (ppm) in tiled spas.
2. The dose rate is 10g of Fi-Clor Spa hardness Increaser per 1,000 litres (220 galls) of spa water. Each dose will raise the hardness by approx 10mg/l (ppm). Add no more than 100g at one time, otherwise the water may cloud excessively.
3. With the circulation system running, sprinkle the product directly into the water around the perimeter of the spa. Do not pre-dissolve as this could generate excessive heat. Only use when bathing has ceased and avoid the area around the skimmers. Bathing may recommence when all the material has fully dissolved.
4. Re-test after 24 hours and if the calcium hardness level is still below the recommended minimum, repeat the dose.