Updated Links:
3 filters for Nova Water Filtration System on Amazon.com:
1st Stage : Sediment Filter (5Micron), 2nd Stage GAC Block (Granular Activated Carbon), 3rd Stage Carbon Block (5Micron):
Amazon.com
Currently $79.50 for all 3 (a package deal).
Tool to remove canister:
Amazon.com
O rings for canisters:
Amazon.com
Silcon Grease:
Amazon.com