Need help please. How do I clear this up ? Looks sort of blackish and dark brown

Welcome to the forum @Mloy

You’ll have to help the experts help you. Have you bought a quality test kit? What type pool do you have? Examples, above ground or in-ground. How many gallons, probably thousands of gallons. All of that info is necessary to guide you.

So, give them a chance to help you clear this up.
 
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.