Exhibit II

to

Schedule 13G

Joint Filing Agreement

The undersigned persons agree and consent to the joint filing on their behalf of this Schedule 13G dated February 13, 2015 in connection with their beneficial ownership of Tetra Technologies, Inc. Columbia Management Investment Advisers, LLC authorizes Ameriprise Financial, Inc. to execute the Schedule 13G to which this Exhibit is attached and make any necessary amendments thereto.

Ameriprise Financial, Inc.
By:	/s/ Martha Skinner
	Martha Skinner
	Director – Financial Reporting – Accounting and Administration Services

Columbia Management Investment Advisers, LLC

By:	/s/ Amy Johnson
	Amy Johnson
	COO and Managing Director