Beginning in 2004, a series of plaster research studies were released by the National Plasterers Council (NPC), which they instigated and financially supported, and which were undertaken by the California Polytechnic State University in San Louis Obispo. In these studies, the researchers concluded that aggressive water conditions were the cause of “spot etching” and other plaster surface defects. The conclusions, and the quality of the research, have long been contested within the industry,…Continue
It appears that the pool industry’s long-time recommended parameters for chlorine and pH levels will be changing in the near future.
The current range of 1 to 4 ppm for chlorine will likely be raised when pool water contains cyanuric acid (CYA), and the pH range will be broadened beyond the current limited range of 7.2 to 7.8. The reason for this change is due to a new understanding of the science of stabilized pool water.
Some years ago, Richard Falk (known as Chemgeek on pool…Continue