466-90142 - Marineland White Diamond Ammonia Neutralizing Crystals 50 oz

White Diamond Ammonia-Neutralizing Crystals are ideal for all freshwater aquariums and ponds.White Diamond removes up to 4 times more deadly ammonia to keep water clean and fish-safe. It protects against sudden ammonia "spikes" and helps control the presence of ammonia...especially during the break-in period.