I was looking something up for another thread on In The Swim and I found this statement on a Dichlor powder page:
This is the first time I have ever seen a chemical supply company acknowledge the CL/CYA relationship. It may not be a chart, but it's more than I have ever seen.– If chlorine seems to be ineffective check the stabilizer also known as cyanuric acid. The correct level for stabilizer is 30-60 ppm. If the stabilizer is too low the chlorine will be used up faster making it appear that the chlorine is not effective. If the stabilizer level is too high it will slow down the oxidizing process and render the chlorine less effective. This must be compensated for by using a higher concentration of chlorine in the pool water.
I also saw this on a Trichlor tablet page:I know they are an online retailer and don't have as much to gain with uninformed customers as a brick and mortar store do, but I am still surprised to see it. Maybe things are starting to change to a more open and honest way of full disclosure when selling chemicals?One 3” (7oz) Tablet of Trichlor delivers approximately 5.495 ppm of available chlorine and 3.27 ppm of Cyanuric acid into 10,000 gallons of water. Trichlor contains 54.2% by weight of the chlorine carrier molecule Cyanuric acid, so every 8oz tablet of trichlor contains 4.336 oz of Cyanuric acid.
Well, maybe not yet, but I still say kudos to them for putting that up.