The Planted Tank Forum - View Single Post - Using purigen in a sponge filter
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post #18 of (permalink) Old 11-07-2013, 04:30 AM
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Join Date: May 2012
Location: Los Angeles,CA
Posts: 729
You can try nitri-zorb, but that just trades nitrates for sodium. I've also added too many o+ tablets and had a nitrate spike that lasted four months. You can wait it out, replace the substrate, or add a ton of plants, or increase water changes.

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