Marine Pure Block 8 x 8 x 4

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8x8x4" Block

Ammonia, Nitrite and Nitrate Removal

Primarily designed to provide deep anaerobic zones for de-nitrification in passive systems.

Live rock substitute-popular among reef hobbyists as a substitute for live rock because it reduces nitrates more efficiently without harming the environment.

Use in sumps, stacked in extra-large filters.

Marine Pure Block 8 x 8 x 4