Cloudy or dull pool water is caused by improper chemical balance or fine debris in the pool water. There are many reasons for cloudy water: ph or alkalinity too low or too high, algae growth, heavy rains, lack of sunlight, too little filtration time.
A swimming pool clarifier is used to clear up cloudy water in swimming pools. Clarifiers are used to coagulate (thicken) tiny particles and oils that form in your pool water. Make sure to check water levels and adjust if necessary. Once the levels are adjusted and clarifier has been added, run your filter system for at least 24 hours. When using swimming pool clarifier always follow the directions according to the packaging. Adding too much clarifier, can often make your pool cloudier.
Flocculants are used to sink all the tiny particles to the bottom of your pool. Make sure to check water levels and adjust if necessary. Once the levels are adjusted and the flocculant has been added, turn the filter off and leave it for about 8-12 hours (varies by label on packaging). Do not disturb the pool water during this time. Slowly vacuum your swimming pool to waste using a manual vacuum. If your pool gets cloudy while vacuuming take a break and allow the particles to settle once again. Once the pool is clear, backwash and rinse filter thoroughly. Flocculants usually work best on Sand or D.E Filters (Diatomaceous Earth).