The Grant-bio POS-300 microprocessor controlled orbital shaking platform is a versatile instrument for many general purpose shaking applications in chemical and life science laboratories.
The four interchangeable accessory platforms enable a wide
choice of vessels to be used, including bottles, flasks and beakers, ... more
The DPD tablet is the most widely used test for determining Free and Combined Chlorine in pool water. Establishing a Free Chlorine residual is the most important step toward protection of bather health. A DPD #1 Rapid tablet will quickly reveal the precise level of Free Chlorine. (Note: Levels in excess of 10 ppm may bleach out any DPD test method.)
The DPD #3 Rapid tablet measures the level of Combined Chlorine. Combined Chlorine is a sanitizer that has reacted with impurities within the water and is, therefore, less capable of disinfecting pool water. It can cause eye irritation and a strong chlorine odor. To test for Combined Chlorine, simply add a DPD #3 Rapid tablet to the Free Chlorine water sample. A measurable increase in sample color indicates undesirable Combined Chlorine, which should be treated with a chlorine or oxygen-based shock treatment