Cloudy Water

Cloudy water is usually either a filtration problem or a chemical imbalance, and telling the two apart saves you from treating the wrong one.

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Filtration & Circulation Issues

Confirm the filter is running long enough each day, since most residential pools need 8 to 12 hours of circulation.
Check the filter pressure gauge and clean or backwash the filter if it reads high above its clean, start-up pressure.
Inspect the pump basket and skimmer baskets for debris that could be restricting flow.
Run the pump continuously for a day or two while the water clears, rather than on a normal timer schedule.

Safety note: Turn off and unplug pump equipment before opening any basket lids or filter housings.

Test pH, alkalinity, and chlorine, since cloudiness is often caused by one of these drifting out of range.
Add a clarifier or flocculant product if the water is cloudy but chemically balanced, to help fine particles clump together for the filter to catch.
Shock the pool if chlorine has been running low, since cloudy water can be an early sign of algae starting to bloom.
Give the filter a full cycle of several hours after any chemical addition before judging the results.

Safety note: Add only one new chemical at a time and wait for it to circulate before adding another, to avoid unpredictable reactions.