Zeolite

Zeolites ("a stone that boils") are minerals that have a micro-porous structure. There are used to remove certain chemicals from water.

In the aquarium hobby, these small white rocks (Sodium aluminosilicate, zeolite A) are used to remove ammonia from the water.

Usually added to an aquarium in an emergency to quickly remove ammonia, a quantity of the chips are placed in a media bag so it can be removed afterwards or simply scattered into the tank as the rock is harmless if left permanently (as long as you never add salt to the tank). It will provide a large surface area for nitrifying bacteria.


 * 1 gram of zeolite will remove 1.5 mg of ammonia.


 * The product can be recharged by the use of ordinary table salt. Take a litre of 5% solution of Salt water and soak the zeolite in it for 24 hours. Then rinse afterwards.


 * Typical product 'Ammo-Chips' or 'Ammo-Carb' by Aquarium Pharmaceuticals Incorporated (look in their product filtration section). Sold by many pet shops worldwide.

Working out the amount to use
Using an accurate test kit, take an ammonia reading of your water in ppm (parts per million) and divide by 1.5. Then multiply by the numbers of litres in your tank. This final volume is the number of grams of Zeolite needed.


 * 1 tsp teaspoon of Zeolite is ~6 Grams.

Links

 * Wikipedia


 * Clinoptilolite zeolite (sodium aluminosilicate) by Timothy A. Hovanec (archived link May 2007)