Updated April 3, 2017. 1  Worldwide, there are over 1.86 billion monthly active Facebook users (Facebook MAUs) which is a 17 percent increase year over year. 2  There are 1.15 billion mobile daily active users (Mobile DAU) for December 2016, an increase of 23 percent year-over-year.
Total Alkalinity. The total alkalinity (TA) is a measure of how much of the alkaline substances there are in the water. In the swimming pool water, we are concerned with bicarbonate alkalinity, which should be between 80 ppm and 120 ppm.When the total alkalinity (TA) is within this range, it prevents rapid pH changes and stabilises the pH level.ote that you should only add sodium bicarbonate at the rate of 1 kg per 50,000 litres of water every 4 days. Raising the TA can therefore be quite a time-consuming, slow process. Lowering the total alkalinity is also a slow process.
If your chlorine level is too low, you add more chlorine. If your pH needs adjusting, you add an acid or base. Additives also manipulate TA and hardness. Related to pH, total alkalinity is a measure of the alkaline substances in the water. The pH depends on TA. When maintained at proper levels, pool water resists a change in pH. Hardness, on the other hand, is a measure of the calcium and magnesium in the water.