![]() Known as bond failure, this will occur as areas where the plaster has popped off. Keep Alkalinity from rising above 120 ppm, which can make pH adjustment difficult and then it becomes hard to lower the Alkalinity without pummeling the pH, since the same chemical (dry acid) is used to lower both pH/Alkalinity. To raise Total Alkalinity in pools, add Alkalinity Increaser, and to lower TA, use pH Decreaser, aka Dry Acid. Low Alkalinity also allows your pH to fluctuate rapidly, which can also cause similar surface problems (see above). Lower levels may contribute to corrosion of the plaster, as it seeks to pull carbonates from the plaster. The absolute lowest pH level for your pool should be 7.2, used for greater potency during shock treatments, however for normal operation, keep your pH between 7.4-7.6 with pH Increasers.Īlkalinity should be kept between 90- 120 ppm. Pitted, etched plaster provides a safe harbor for dirt and algae to grow and is rough or uncomfortable for swimmers. These etched areas become stained easily, making them more visible, and most are too shallow to patch effectively. Low pH levels in a pool creates spot etching or corrosion of soft areas in the plaster, areas of delamination, or in areas where the plaster is ‘bent’, such as on steps and in corners. The plaster surface is meant to degrade slowly, eventually requiring a fresh coat, or at least some pool plaster repair. Plaster finishes provide twenty years of service under ideal conditions, however, ours is rarely an ideal world. Used underwater, it provides the watertight seal that the more porous gunite or shotcrete beneath it cannot. pH will rise the first season with new plaster, so get a large bucket of pH Decreaser, to keep the pH in the 7.6 range, and a bucket of Alkalinity Increaser, which will drop with the frequent pH Down adjustments.Īlso called whitecoat or marcite, pool plaster is an age old process of finishing many structures. This is the time that takes the most work, usually a lot of brushing and backwashing due to dusting from the new plaster. Once the pool is full, the system is started up and balanced with chemicals. Once the plasterers apply the finishing touches, they start filling the pool with water immediately, as plaster cures under water. As the final step in the pool construction process, the pool interior is sprayed with a wet plaster mix, and troweled smooth. The tile and coping stones are set in place. After that, the pool is shot with gunite (or shotcrete), which is concrete that is shot out of a gun or large spray nozzle, and troweled to the finished shape. The main drains, skimmers, return lines, pool lights etc., are set into place. The process starts with digging a hole in the ground and lining the hole with rebar. Concrete pools are the oldest form of building pools.
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