[quote author=sfsuphysics link=topic=6683.msg86325#msg86325 date=1236198467]
For some reason I can't ever see anything posted at Reefbuilders, it comes up with a header and then nothing on the page. But since the erasers dissolve quickly, what are they made of?
[/quote]
...also from the discussion thread with the article.... "as the scrubber abrades it will add additional nitrogen to the tank as melamine is highly saturated with primary and tertiary nitrogens". But... "The nitrogen mineralization process for melamine is extremely slow".