Palintest Photometer Alkalinty Test Tablets is a measure of all the alkaline materials in the pool water. Palintest Alkalinity (Alkaphot) Test Tablets, pack of 250, suitable for use in Palintest Photometer Test Kits. These tablets test Total Alkilinity levels over a range of 10 - 500 mg/l. Use genuine Palintest test tablets with your Palintest Photometer Test Kit to ensure the most accurate test results are achieved. Palintest AP188 Palintest Alkaphot Photometer Tablets - Total Alkalinity Test Tablets Total Alkalinity This is a measure of all the alkaline materials in the pool water. In the pH range found in pool waters, the alkalinity is likely to be present in the form of Sodium Bicarbonate. At the correct level, the pH will not alter rapidly as the water is said to be buffered. If the total alkalinity is below 80 p.p.m. then the water will be insufficiently buffered and if it is above 200 p.p.m it will be excessively buffered. In either case the effect of the addition of chemicals will be difficult to control.