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Otherwise a media bag in a high flow compartment will work. Don’t pack it tight, move it around in the bag every week or so to make sure it’s all getting contact, and clean it per instructions when it turns brown.
The only thing I don’t like about purigen is using a bag instead of a reactor. I started thinking about it, using a small DI cartridge like what aquatic life uses for their smaller systems. low flow with the fine mesh should hold the purigen inside. I would imagine it would clog quickly on...