Quartz Bio-Rings

• How often should I change this media?

  Never, you don't have to change it.

• What size pack do I need for my filter?

  A 450g pack should be sufficient for external filters filtering 100-150 litres of water. You will need to add the media to a filter compartment or enclose in a filter sack to contain in the filter ( This depends on the type of filter you are using). Biological filter media should always be positi...