Formaldehyde-based water conditioners have recently become more prevalent in the aquarium hobby due to their ability to neutralize ammonia and nitrite, along with chlorine and chloramine. The downfall of these products is that they inhibit the growth of beneficial bacteria in the biological filter, and can even deplete oxygen levels in your system in high enough doses.
Barrier Classic is a high quality, multi-purpose water conditioner for all freshwater and saltwater aquariums. It instantly neutralizes chlorine, chloramine, and toxic metals. This safe, non-formaldehyde formula also provides necessary electrolytes and replaces fishes' slime coat to reduce stress and defend against disease.