Exhibit 23.1

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CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

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We have issued our report dated March 5, 2021, with respect to the consolidated financial statements included in the Annual Report of FTS International, Inc. on Form 10-K for the year ended December 31, 2020. We consent to the incorporation by reference of said report in the Registration Statements of FTS International, Inc. on Form S-1 (File No. 333-251625) and on Form S-8 (File No. 333-250202).

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