Start with observations
Note when the cloudiness began, whether it follows heavy use or weather, and if the water has changed colour. A photo may help describe it, but appearance alone rarely gives the full answer.
Check the water and circulation
Recent test results, filter operation, pump run time and visible flow all provide useful clues. A water issue may return if circulation or filtration is not addressed.
Avoid guesswork
Adding multiple products without understanding readings can make diagnosis harder. Follow product instructions and seek appropriate advice before anyone swims if water clarity is poor.