After researching these ceramic melting blocks from different suppliers, it turned out that they are all identical in design - so why pay more? Extremely porous and durable, I use them in a Laguna pond filter and they seem to handle the current well. Ammonia and nitrite remain zip00. With a good pre-filter they don't get dirty or clogged (and you don't wash them anyway, right!) The nest keeps my fish happy! Much better than the bio-stone the filter comes with
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