Citric acid for aquarium

If I want some citric acid to clean my powerheads, can I just buy a bag of it on amazon and use that? What proportion should I mix with RO water?

Or am I just better off paying a bit more for the BRS stuff?

Yep you can. I got mine on Amazon. Just get food grade stuff. I think it is 1 cup to 1 gal, but double check that.

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This is the stuff I bought. Going by BRS it is 4 tablespoons to 1 quart of water