Exhibit 21

TETRA Technologies, Inc.

List of Subsidiaries or Other Related Entities

December 31, 2010

Compressco, Inc.

Compressco Canada, Inc.

Compressco Testing, L.L.C.

Compressco Field Services, Inc.

Compressco Field Services International, LLC

Compressco de Argentina SRL (10)

Compressco Holdings, LLC

Compressco Netherlands Cooperatief U.A.(1)

Compressco International, LLC

Compressco Leasing, LLC

Compressco Mexico Investment I, LLC

Compressco Mexico Investment II, LLC

Compressco de Mexico S. de RL de C.V. (11)

Compressco Partners Manufacturing, LLC

Compressco Netherlands B.V.

Compressco Partners GP Inc.

Compressco Partners, L.P. (12)

Compressco Partners Sub, Inc.

Compressco Partners Operating, LLC

TETRA Applied Holding Company

TETRA Applied Technologies, LLC

EPIC Diving & Marine Services, LLC

Maritech Resources, Inc.

Maritech Holdings, Inc.

Maritech Louisiana, LLC

Maritech Partner, LLC

T-Production Testing, LLC

TETRA Production Testing Services, LLC

TETRA Financial Services, Inc.

Kemax B.V. (3)

TETRA-Hamilton Frac Water Services, LLC

TETRA International Incorporated

Ahmad Albinali & TETRA Arabia Company Ltd. (LLC) (2)

Production Enhancement México, S.A. de C.V. (4)

Providence Natural Gas, Inc.

TETRA Angola Investments, LLC

TETRA de Mexico, S.A. de C.V. (7)

TETRA Foreign Investments, LLC

TETRA International Holdings, B.V.

TETRA Completion Services Holding B.V.

TETRA Completion Services B.V.

T-International Holdings C.V. (5)

TETRA Netherlands, B.V.

TETRA Chemicals Europe AB

TETRA Chemicals Europe OY

EMC2 S.r.l.

TETRA Technologies de Mexico, S.A. de C.V. (8)

TETRA Technologies de Venezuela, S.A.

TETRA Technologies do Brasil, Limitada (9)

TETRA Technologies (U.K.) Limited

TETRA Technologies Nigeria Limited

TETRA International Employment Co. Ltd.

TETRA Medit Oil Services (Libya) (13)

TETRA Madeira Unipessoal Lda

TETRA Yemen for Oilfield Services Co., Ltd.(6)

TETRA Micronutrients, Inc.

TETRA Process Services, L.C.

TETRA Technologies Australia Pty Ltd

(1)	99% Compressco Field Services, Inc. and 1% Compressco Holdings, LLC
(2)	50% TETRA International Incorporated and 50% Unrelated Party
(3)	50.0025% TETRA Financial Services, Inc. and 49.9975% Unrelated Party
(4)	99.9% TETRA International Incorporated and 0.1% owned by TETRA Technologies, Inc.
(5)	96% TETRA International Holdings, B.V. and 4% TETRA International Incorporated
(6)	99% TETRA International Incorporated and 1% TETRA Foreign Investments, LLC
(7)	99.998% TETRA International Incorporated and .002% TETRA Technologies, Inc.
(8)	99.998% TETRA International Incorporated and .002% TETRA Technologies, Inc.
(9)	99.998% TETRA International Incorporated and .002% TETRA Technologies, Inc.
(10)	90% Compressco Field Services International, Inc. and 10% Compressco International, LLC
(11)	51% Compressco Mexico Investment I, LLC and 49% Compressco Mexico Investment II, LLC
(12)	99.9% Compressco Field Services, Inc. and 0.1% Compressco Partners GP Inc.
(13)	65% TETRA International Incorporated and 35% Mediterranean Oil Services