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A common mistake many pool owners make is using Dichlor chlorine for weekly pool maintenance and shocking. This is bad on many levels.
Dichlor is a stabilized form of chlorine, unlike liquid (sodium hypochlorite) and granular (calcium hypochlorite). You're adding CYA to the pool each time you chlorinate your pool water. The proper range for CYA is 30 - 50ppm.
For every 10ppm of chlorine added with Dichlor, you'll raise the CYA by 9ppm. For every 10ppm of chlorine added with Trichlor tabs you'll raise the CYA by 6ppm.
You only want to use liquid chlorine for weekly pool water maintenance. Granular chlorine will add hardness to the water and will increase the pool pH because it has a pH of 12.
Remember to keep your chlorine levels between 2 - 4ppm.
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