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Re: Aquatic Plants Digest V4 #1644

> Has anyone done any measurements on charcoal (activated carbon, not
> anthracite) effectiveness and how long it lasts?
> Scott H.

Scott, one relative indicator is to set up a small tank with a proportionately small 
activated carbon filter.  Pour in acriflavin dye, the charcoal will remove the dye, either 
completely or almost completely.  You can repeat this until the charcoal no longer 
impacts the dye.  It's a layman's approach, but gives a great visual on what/how 
much the charcoal is doing.