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Is there a difference between Rowaphos and Phosban? I'm reading that Rowaphos is much more effective but a friend of mine at my local LFS said they are the same exact thing and there is no difference.
I wouldn't say they are the same exact thing, but they are essentially the same thing processed a little differently. Both work well, and on a practical level unless you are the kind of reefer who likes to split hairs over very minor differences between quality products, they are inter-changeable.