ALKALINITY CONTROL Sample Clauses

ALKALINITY CONTROL. This section will only deal with the chemicals and equipment used, a breakdown of pH and Reserve Alkalinity is covered in Section 7. When acids such as Alum and Chlorine are added to the water together with body acids the water has a tendency to become acidic and as such would produce unsatisfactory bathing conditions. To neutralise this acidity an alkali, usually in the form of Soda Ash (Sodium Carbonate) is added at the following rates: For every 1kg of Alum – ½ kg of Soda Ash For every 1kg of Chlorine - 1 ½ kg of Soda Ash. A further addition should be made over and above these figures to counteract the body acids introduced by bathers. The amount of this addition varies and can only be determined by experience, or in other words, by trial and error. If ever it is necessary to raise the reserve alkalinity quickly it is recommended that Soda Bicarbonate be added to the pool water. The quantities again are determined by experience. You cannot create any major difficulty by adding too much Soda Bicarbonate as a saturated solution will only give a pH of 8.3 and this can be reduced to the desirable level by the addition of acids. If the pH is permitted to become too high it may dissolve the floc on the filter and carry it through to the pool giving the water a cloudy effect. For this reason DO NOT slug dose with Soda Ash.