SHAUF POA

POWER OF ATTORNEY

FOR EXECUTING FORM ID, FORMS 3, FORMS 4 AND FORMS 5,
FORM 144 AND SCHEDULE 13D AND SCHEDULE 13G
The undersigned hereby constitutes and appoints
Adam R. Law, Holli C. Ladhani and the Section 16 Compliance Officer,
or any of them acting without the others, with full power of
substitution, as the undersigned's true and lawful attorney-in-fact to:
(1) Execute for and on behalf of the undersigned a Form ID
(including amendments thereto), or any other forms prescribed
by the U.S. Securities and Exchange Commission (the "SEC"),
that may be necessary to obtain codes and passwords enabling
the undersigned to make electronic filings with the SEC
of the forms referenced in clause (2) below;
(2) Execute for and on behalf of the undersigned any
(a) Form 3, Form 4 and Form 5 (including amendments thereto)
in accordance with Section 16(a) of the Securities Exchange
Act of 1934, as amended (the "Exchange Act"), and the
rules thereunder,
(b) Form 144 (including amendments thereto)and
(c) Schedule 13D and Schedule 13G (including amendments
thereto) in accordance with Sections 13(d) and 13(g) of the
Exchange Act, but only to the extent each form or schedule
relates to the undersigned's beneficial ownership of
securities of Select Energy Services, Inc. or any of its subsidiaries;
(3) Do and perform any and all acts for and on behalf of the
undersigned that may be necessary or desirable to complete
and execute any Form ID, Form 3, Form 4, Form 5, Form 144,
Schedule 13D or Schedule 13G (including amendments thereto)
and timely file the forms or schedules with the SEC and
any stock exchange or quotation system, self-regulatory
association or any other authority, and provide a copy
as required by law or advisable to such persons as the
attorney-in-fact deems appropriate; and
(4) Take any other action in connection with
the foregoing that, in the opinion of the attorney-in-fact,
may be of benefit to, in the best interest of or legally
required of the undersigned, it being understood that the
documents executed by the attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in
the form and shall contain the terms and
conditions as the attorney-in-fact may approve in
the attorney-in-fact's discretion. The undersigned hereby
grants to the attorney-in-fact full power and authority to
do and perform all and every act requisite, necessary or proper
to be done in the exercise of any of the rights and powers
granted herein, as fully to all intents and purposes as the
undersigned might or could do if personally present, with full
power of substitution or revocation, hereby ratifying and confirming
all that the attorney-in-fact shall lawfully do or cause
to be done by virtue of this Power of Attorney
and the rights and powers granted herein. The
undersigned acknowledges that the attorney-in-fact, in
serving in such capacity at the request of the undersigned,
are not assuming (nor is Select Energy Services, Inc. assuming)
any of the undersigned's responsibilities to comply with Section
16 of the Exchange Act. The undersigned agrees that the
attorney-in-fact may rely entirely on information furnished
orally or in writing by or at the direction
of the undersigned to the attorney-in-fact.

The undersigned also agrees to indemnify and hold harmless
Select Energy Services, Inc. and the attorney-in-fact
against any losses, claims, damages or liabilities (or
actions in these respects) that arise out of or are based
upon any untrue statements or omissions of necessary facts in
the information provided by or at the direction of the undersigned,
or upon the lack of timeliness in the delivery of information by or
at the direction of the undersigned, to the attorney-in fact for purposes
of executing, acknowledging, delivering or filing a Form ID, Form 3, Form 4,
Form 5, Form 144, Schedule 13D or Schedule 13G (including
amendments thereto) with respect to the undersigned's holdings of
and transactions in securities issued by Select Energy Services, Inc.
and agrees to reimburse Select Energy Services, Inc. and the attorney
-in-fact on demand for any legal or other expenses reasonably incurred in
connection with investigating or defending against any such loss,
claim, damage, liability or action.

This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Form ID, Form 3,
Form 4, Form 5, Form 144, Schedule 13D and Schedule 13G (including
amendments thereto) with respect to the undersigned's holdings of
and transactions in securities issued by Select Energy Services, Inc.,
unless earlier revoked by the
undersigned in a signed writing delivered to the attorney-in-fact.
This Power of Attorney does not revoke any other power of attorney
that the undersigned has previously granted.

[Signature Page Follows]

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of the date written below.

Dated: April 1, 2019
/s/ Mitchell Shauf
Mitchell Shauf
Executive Vice President, Water Services


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Execution Version

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