Exhibit 1

Joint Filing Statement

Statement Pursuant to Rule 13d-1(k)(1)

The undersigned hereby consent and agree to file a joint statement on Schedule 13G under the Securities Exchange Act of 1934, as amended, with respect to the common stock, par value $0.001 per share, of Energy Recovery, Inc. beneficially owned by them, together with any or all amendments thereto, when and if appropriate. The parties hereto further consent and agree to file this Statement pursuant to Rule 13d-1(k)(1)(iii) as an exhibit to Schedule 13G, thereby incorporating the same into such Schedule 13G.

Dated: February 16, 2018	Sundt AS

	By:	/s/ Jakob A. Iqbal
	Name: Jakob A. Iqbal
	Title: Investment Director

	CGS Holdings AS

	By:	/s/ Leiv Askvig
	Name: Leiv Askvig
	Title: Chief Executive Officer

	Helene Sundt AS

	By:	/s/ Leiv Askvig
	Name: Leiv Askvig
	Title: Chief Executive Officer

	/s/ Christian Gruner Sundt
	Christian Gruner Sundt

	/s/ Else Helene Sundt
	Else Helene Sundt

	/s/ Leiv Askvig
	Leiv Askvig

	/s/ Jakob Asif Iqbal
	Jakob Asif Iqbal