Pool water can appear blue but not be clear due to poor filtration or inadequate water chemistry balance.

Yes, if the pool filter is old or clogged, it won't be able to remove small particles from the water and can cause it to appear cloudy.

The blue color in pool water comes from the absorption and scattering of light by the water molecules themselves and any added chemicals.

Proper maintenance of your pool is important including regular cleaning, balanced water chemistry, and a clean and functional pool filter.

While the blue color may not be harmful, the cloudy or opaque water may indicate a bacterial issue, so it's best to avoid swimming until the issue...