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Disposable Undergravel Filter Cartridges
- Contains Filtrez - A powerful synthetic absorption resin.
- Extends filtration life.
- Absorbs ammonia, nitrites, nitrates and clears up discoloration.
- Stabalizes pH and reduces green algae.
- Fits both Penn Plax Undertow and Perfecto Perfect-A-Flo UG
Filters.
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