Thank you very much. I see this errors:

Journal article: missing dot between name of article and name of journal
book and chapter in book: Place, Publisher instead of correct Publisher, Place
thesis and report: name of thesis is in italic but correct is non italic (normal) font
thesis: place of university is not showed in the guide for authors
thesis: type of thesis is not in parentheses in guide
thesis: between name of thesis and type of thesis is dot
proceedings: missing name of conference, for example: if I have name of proceedings = "proceedings of" and name of conference = "the 9th World Congress on Anaerobic Digestion – Anaerobic Conversion for Sustainability" I got only "proceedings of" (there could be capitalized first letter)
proceedings: the publisher is not in the guidance showed
personal comunication (interview, email): after the name of author is only year in parentheses correctly, full date is behind tthe Title (I´ve tested it with Title = "personal comunication" but I think it these Zotero types can be with empty Title
report: type of report and number of report is not in parentheses
report: correctly should to be Publisher, Place.
report: missing Number of pages on the end of reference

Thanks again for your great work

I have in the Container title "proceeding of" and "the 9th World Congress on Anaerobic Digestion – Anaerobic Conversion for Sustainability" is in the Conference Name.

I see this errors:
inline citation: Where more than two authors are involved, the first author’s name followed by 'et al.' (not italicised) should be used.
journal article: missing dot after pages
book: title of book is not italicized
book: missing dot after place
chapter in book: title of book is not italicized
chapter in book: if Book Author is used (instead of Editor) then bibliography looks like "PH Gleick" instead of "Gleick PH"
thesis: place of university is not showed in the guide for authors
proceedings: the publisher is not showed in the guidance
proceedings: missing name of conference (as in my last message)
report: correctly should be Publisher, Place not Place: Publisher
report: missing dot after report number

Thanks for quick reply

In some cases is the title of conference proceedings book "empty" or completely different from the name of the conference. For these cases, I add to iso690-author-date-cs.csl drawing name of the conference too. I am not sure if it is necessary in this case.

I've looked at your code and have these recommendations:
1. change on line 594 et-al-min="6" to et-al-min="3"
2. add in line 37 name-as-sort-order="all"
3. from macro name="issued" can be completely deleted lines 347-359
4. to the macro name="title-plus-extra" add code
<else-if type="interview personal_communication" match="any">
<group prefix=", " delimiter=" ">
<date variable="issued">
<date-part name="day"/>
<date-part name="month"/>
<date-part name="year"/>
</date>
</group>
</else-if>
before
<else-if type="post-weblog webpage" match="any"> tag
5. to the macro name="title" add code
<else-if type="interview personal_communication" match="any">
<text variable="title"/>
</else-if> before <else> tag
6. delete suffix=" " from <text macro="title-plus-extra" suffix=" "/> on line 618 (I am not sure, why it is in this line)

@adamsmith you're right, but I every time forgot on this github's functionality.

I've asked the editor of Water SA about "place of the university is not showed in the guide for authors" and the answer is that it is not a problem to involve the place of the university to the bibliography.
@damnation do you create a new version of the style? I've agreed with editor to send output from style template to the editor for checking the accuracy.

Pull request for new style has created
https://github.com/citation-style-language/styles/pull/2677