Your filter is probably the culprit.

Yes. Shock kills bacteria and algae, but it doesn’t remove the dead particles. If your water is still cloudy, the filter isn’t doing its job — or you need to run it longer.

The most common fix: run your pump 24 hours and backwash or clean the filter. If that doesn’t clear it, check your chemistry. High calcium hardness or phosphates can make water hazy even after shocking. A clarifier or flocculant can help clump tiny particles so the filter catches them.

Also make sure your chlorine level actually held. If it dropped again fast, you might have ammonia from stabilized chlorine buildup. That means a partial drain and refill.

Don’t chase shock with more shock. Figure out why the cloudiness is still there.