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General Carbon is where I've been getting it. What granule size do you use?

I haven't read all of the posts in this thread, too many, BUT, here's what I did: Bought a nice big quality filter and when it was used up, I just drilled out the 3 rivets holding the bottom cover on, emptied it out, and poured in new carbon which I buy in bulk. Put the cover back on, put in 3...

What grain size of activated carbon do you use ? I refilled mine with some and it isn't working well at all. Maybe the grain size is too large??