In general you will need one filter for each phone device (including normal phone handsets, Sky TV Decoders, alarm panels etc) you have in the house.
When you purchase a router from us, it will normally include at least one filter.
You can purchase additional filters from many electronics stores such as Noel Leemings, Harvey Norman, or online.
If the filter provided with a router we have sold becomes faulty, we will replace these at no cost.
We also are able to sell a filter to you for $10. This will be couriered out if needed. The fee will just be charged to your NOW account.
Note: Fibre customers do not need to use filters on their phone jacks