Seachem Tidal 55 Zeolite 145g

Seachem Zeolite™ has the highest ammonia binding capacity of any available zeolite; ten times higher than some products and twice the capacity of the closest competitor.
Seachem Zeolite™ for the 35, 55, 75, and 110 units comes pre-bagged in Seachem Zip Bags, which feature durable seams & a corrosion-resistant zipper.