The Planted Tank Forum - View Single Post - Using purigen in a sponge filter
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Old 11-07-2013, 03:30 AM   #18
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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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