Too much GAC?

Well there is dosing directions on the packaging. Not sure if it matters? It says 1/2 cup per 50 gallons. That seems quite small for a reactor.
 
I'm not sure on that one, but somee brands have substantial fines (black dust on rinsing) and overdoing them can be a potential concern for HLLE. Others, like ROX carbon from BRS seem to have almost no fines, and the risk of overdoing them may be smaller.. :)
 
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