If you have fresh (not salt) water, then you need to shock the pool. Shock is an actual thing, it's a liquid you buy by the gallon in the pool supply store. If your pool is less than 15x15 square and 4 feet deep, then just add one gallon. If it's larger, add another gallon a few hours after you added the first. Turn the water pump on. Let it stay on for at least 24 hours, non-stop. Don't go into the pool for at least 6 hours after applying the last of however much shock you poured in. It's pretty potent stuff and will bleach your swimsuit. For salt water I have no idea, never had a salt water pool.
That'll clear it up. It's caused primarily by temperature. It's algae. Nothing to get alarmed about or blame the pool company for; they can't control the weather. They can fix it for you too, but the above directions is the quick fix to clear it up temporarily. Once it's cleared up it'll still need all the chemical levels checked and adjusted. Might need a little calcium too but let the pool professionals take care of that part for you if you're not comfortable running the tests yourself.
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