The investigation into the pair uncovered links to both organised crime in Auckland and Asian-based criminal specialists who provided pre-cursor materials for manufacturing 'P', police said.
Detective Sergeant Glenn Tinsley said the 17-year jail sentence handed out to Filer in Hamilton Court on Friday reflected the widespread damage wrought by the production and distribution of methamphetamine.
"It's the Scott Filer's of this world and people like him that supply our young people with these strongly addictive and destructive drugs and it's pleasing to know in this case that a significant supply of these drugs into the Coromandel has been disrupted."
Mr Tinsley said the investigation team still wanted to find Merhtens, who he described as a significant "loose thread" in the case.
Merhtens was described as 177cm tall of medium build with a distinctive large lump or growth on the right side of his neck.
He has had had access to firearms and police warned he should not be approached.
- HERALD ONLINE