Chemi-pure can be used with all water types as a chemical absorption filter and ion generator and exchange unit to positively keep pH at a perfect constant level. Also fantastic for use with African Cichlids and Discus! Needs replacement only every six months under normal circumstances. Use 1 unit up to 40 gallons, 2 units from 40 to 100 gallons, above 100 gallons add one unit for every 25 gals. 10oz.

Specifications:

• Does Chemi-pure remove trace element?
  You do not have to worry about Chemi-pure removing significant amounts of trace elements. Chemi-pure does contain some carbon and will remove small trace amounts of some elements, but not to the extent where you would notice any significant effects on any levels in your aquarium.
• Will Chemi-pure raise my pH higher than it is now?
  Chemi-pure works together with your waters chemistry to safely buffer an improper or low pH. It will not raise your pH from any level, but help keep it at a constant level for your aquarium.
• Can I open the bag and separate the product to fit into my filter?
  No, you should never cut open the bag and separate the product at all. The product ingredients do not mix evenly. If it is separated, you may not get the full benefits of the product as it is designed to do.
• Where in my filter should I place the product?
  Anywhere that you can put the product so it has a substantial flow of water going through the bag will do just fine.