From the Recommended Levels Chart (link below): "CH 0-350 (Don't add)"
(FYI) in case you need it: Copied from a previousr thread: "In a vinyl pool you don't have to worry about low CH only high. The only reason to worry about it would be if you had a piece of equipment that the warranty hinged on the CH being maintained at some level." CH does not stabilize other chemicals and is not needed to make a pool look good. Too low a CH can have a pool have more foaming, but usually it's a spa where this is an issue since there is far more aeration. Around 120-150 ppm CH helps to eliminate foaming in a spa, but is not usually needed in a pool.
"Calcium is only needed in a pool or spa when one is trying to saturate the water with calcium carbonate -- that is, adjusting pH, TA, CH (and temp and CYA) to have a zero saturation index -- for the purpose of preventing calcium carbonate from dissolving from plaster surfaces and grout between tile. If there is no calcium carbonate in a surface exposed to the water, then there is no need for such calcium carbonate saturation. It's as simple as that."
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