Special zeolite
Breeders Best Zeo Clean by Swiss Rainbow Reef is a high-purity natural zeolite with a high proportion of clinoptilolite for all aquarium systems. 
 
Highly porous without any additives. Reduction of ammonia and ammonium. Lowering the nutrients. Improves the skimmer performance significantly.
 
1000ml for 400L aquarium volume net.
 
Replace every four weeks.