for Aqua Chem Algaecide Plus (see here
) says it contains 3.3% copper derived from copper sulfate pentahydrate and also contains polymeric polyacrylate and gluconate stabilizing agents.
So at least we now know where the copper came from. Your pool tech either overdosed or didn't follow the instructions and had the pH too high when this algaecide was added. I'd never use copper algaecide in a pool because there is always the risk of staining. You can lower your pool pH which should lighten it up a bit and can use a metal sequestrant to try and bind to the copper, though quite frankly longer term the only way to remove metals from the water is through water replacement (you can sometimes get lucky and get a metal sequestrant combined with a clarifier that lets you filter and backwash the metal, but that's not reliable).
So follow the instructions in the earlier link I gave on metals in the water. Also, your chlorine level is probably too low and you never mentioned the Cyanuric Acid (CYA) aka stabilizer or conditioner level which might be high and the original cause of algae that prompted your pool person to add algaecide. Welcome to the endless cycle of using pool chemicals to combat problems that could easily be avoided by simply maintaining an FC relative to CYA. Please read the Pool School
if you want to learn to maintain your pool yourself at low cost and have a trouble-free pool.