Trichlor pucks are acidic, so they will cause your ph to fall some. You probably don't need to add any acid at this point as the trichlor will probably take care of ph that is a little too high. And, since your cya level is only 20 for now, you can stand for it to be a little higher. The pucks will also add some cya. For now, things look fine. Just remember to keep an eye on your ph and your cya level. A cya level of 30-50 is what we recommend, so when you approach that level later in the summer, you'll want to stop the pucks and switch to chlorinating with bleach.
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