Granulated activated carbon filtration (GAC) effectively removes organic contaminants from water, but this filter system collects nitrate during the treatment process and then releases it into the water. Since nitrification occurs frequently with ammoniated waters, monitoring the amount of ammonia in GAC filters can control nitrate levels. This system reduces total ammonia in the system.

Gives an explanation of the importance in purifying water to ensure that there is no more ammonia in it. This website also gives diagrams and pictures of an ammonia purification system.

This website gives ideas for filters that reduce or get rid of turbidity.

This website explains how to make a water purification system and how it works.

Zeolites are microporous crystalline solids with well-defined structures. Generally they contain silicon, aluminium and oxygen in their framework and cations, water and/or other molecules within their pores. Many occur naturally as minerals, and are extensively mined in many parts of the world. They are great for absorbing chemicals that are present in water, but aren't supposed to be.