High calcium hardness: Very high calcium hardness levels in pool water will lead to excess calcium, which can't dissolve in water and accumulates in your pool.This process raises the pH to recommended levels. The process of lowering total alkalinity involves aeration after adding muriatic acid. A high TA causes pH and calcium scaling, both of which are associated with cloudiness. High total alkalinity (TA): You also need to closely monitor changes in the level of TA.On the other hand, if your pH gets too low, chlorine becomes very reactive and depletes very fast, forming lots of combined chlorine (chloramine), which turns the water cloudy and is ineffective in killing bacteria, algae, and other microorganisms in your water. Very high pH usually leads to calcium not dissolving properly, causing cloudy pool water and calcium scaling both in saltwater and non-saltwater pools. The pH is not directly associated with cloudiness in the water, but it affects how chlorine and other chemicals work in your water. Improper pH and chlorine levels: These are the most common culprits.Using wrong chemicals or adding incorrect amounts are the major causes of cloudy water and may even lead to algae if extra care is not taken. Pool chemistry is the trickiest part of pool management. How Wrong or Imbalanced Pool Chemicals Cause Cloudy Water Run-off water brings in minerals including nitrates, phosphates, silicates, and sulfates into your pool that may make your water cloudy. Insects, bird droppings, and run-off water after a storm or rain also contribute to cloudy pool water. Environmental factors, debris (particles), and minerals deposits: Dust, pollen, and leaves can build up in your filter and impede the cleaning process.Faulty filter: Poor filtration means you might not be running your filter long enough, you have clogged or worn-out filter cartridges, or there is scaling on filter, which all result in poor water circulation.Imbalanced chemicals: An improper chemical balance might mean there is too much or too little chlorine, or the pH, alkalinity, calcium hardness, or stabilizer (cyanuric acid) levels are imbalanced.