The journal “DESALINATION AND WATER TREATMENT (Science and Engineering)” published by Desalination publications is indeed indexed in Scopus:
https://www.scopus.com/sourceid/19700175585
It is having an official Clarivate impact factor (0.854) as well.
Till 2017 this journal was published by Taylor & Francis. It looks ok but it is somewhat odd that the Scopus source page does not display the homepage of the journal.