Zeo-PURE™ is a 100% natural, high-capacity ammonia binding media that can also remove heavy metals. It is highly porous with a large surface area for bacterial action. Use 1 cup (240 ml) of Zeo-PURE™ for every 50 gallons of water. Zeo-PURE™ should be rinsed first in freshwater and then poured into a filter bag. Next place in your sump, filter or other part of the system where there is good water flow. Can also be placed in canister filters, box filters and other common filters. For long term ammonia control use our One & Only Live Nitrifying Bacteria.