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.
Alexandrite Effect is the phenomenon of an observed color change from greenish to reddish with a change in source illumination due physiological response of the human eye in a particular part of the visible spectrum. Daylight contains high proportions of blue and green light and incandescent lighting contains a higher balance of red light.