Exhibit 6

JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, each of the undersigned acknowledges and agrees that the foregoing statement on this Schedule 13D is filed on behalf of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on behalf of the undersigned without the necessity of filing additional joint acquisition statements. Each of the undersigned acknowledges that it shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning it contained therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he, she or it knows or has reason to believe that such information is inaccurate.

Dated: June 2, 2022

ProFrac Holding Corp.
By:	/s/ Robert J. Willette
	Name: Robert J. Willette
	Title: Chief Legal Officer
ProFrac Holdings, LLC
By:	/s/ Robert J. Willette
	Name: Robert J. Willette
	Title: Chief Legal Officer
ProFrac Holdings II, LLC
By:	/s/ Robert J. Willette
	Name: Robert J. Willette
	Title: Chief Legal Officer