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There is another thread on the forum where this is discussed. You can get it directly from Pleasant Valley, or this brand from Amazon. It must be safe for aluminum. Also, you need to mix it with distilled water (50/50) if memory serves.
I am a newbee. I just purchased the Century TF-1 from Amazon. Dilute 50/50? Is says on the bottle, "Do NOT Dilute." Very confused at this point.