I found info that cloudy water can be caused by improper levels of chlorine, imbalanced pH and alkalinity, very high calcium hardness (CH) levels, faulty or clogged filter, early stages of algae, ammonia, and debris.
So you can try:
1. Balance free chlorine (FC) levels. If FC is low, you need to shock your swimming pool to fix cloudy water and kill bacteria before you get algae or ammonia in your pool.
2. Eliminate ammonia and get rid of young algae.
3. Monitor and balance pH and TA levels.
4. Correct calcium hardness (CH) levels.
5. Remove foreign particles and mineral deposits, scrub, and vacuum up the pool.
Imbalanced chemicals can also cause cloudy water: too much or too little chlorine, or the pH, alkalinity, calcium hardness, or stabilizer (cyanuric acid) levels are imbalanced.
Or you can google 'cloudy water in the pool', and find some articles about the causes of cloudy swimming pool water and how to clear it.
The environment and weather may also be the cause of cloudy water. To fix and prevent cloudy water you need to remove algae, scrub and clean the pool using a large leaf net and vacuum. Then do a pool shock to get rid of any remaining algae. Here is also important to choose the right vacuum and vacuum head. You can find info about choosing it in some youtube reviews or guides/articles. As an example, I found a buying guide about pool vacuum heads. As far as I can see, it's a review of different types of vacuum heads, its pros, and cons. As for me, I prefer to read peoples' comments about their purchase in the online store.
By the way, all info I found in this article: https://dengarden.com/swimming-pools/Cloudy-Swimming-Pool-Water#:~:text=Cloudy or milky swimming pool,algae%2C ammonia%2C and debris. And if shocking and cleaning won't work, you can read it because I wrote some of advices I found. There are more of them.
Hope it will help 😉