What is the ruling on selling chemical materials to companies that produce and sell unlawful clothing, and to liquor stores? And what is the ruling on trading in water analysis devices for swimming pools in mixed-gender places or places where 'awrahs (private parts) are exposed?

There is no harm in a company selling materials that might be used for impermissible things. The mere possibility of such use does not prohibit the sale, just as selling materials to a liquor dealer, without knowing that he uses them in the production of alcohol, is permissible, unless it is highly probable or known. There is also no objection to selling equipment used for purifying swimming pool water and the like. Any evil acts that occur there do not prevent the sale, because these places were not designated for disobedience.