It does a wonderful job of keeping the water free of toxins from corals and lasts for 3 to 6 months depending on your bio-load. As long as you keep your pre-filters clean that is. That is the only drawback I've seen, I have to rinse the pre-filters about every three days to keep from forming a nitrate spike.Before I added the bio-zorb, I wasn't using any sort of sponge in the filter, just a back of carbon that I changed weekly. But this has definitely reduced my costs.
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