Negative Positive
Title: Working great.
Review: The 500 grams isn't the most clear of descriptions, but this box is more than enough to fill a 206 box. The rings were added to provide excess bio filtration and are sitting in boxes 2 and 3 in my 206. There were enough rings to fill up the small number of rings packed with the filter and the box that contained the carbon all the way to the top.Don't have real comparison, but these are doing their job and staying intact.
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