Every pool owner knows the pain. You stroll by one morning and glance over with the startling realization that your pool water looks like Pineapple Papaya Passionfruit Softsoap, or perhaps like ...

Calcium: Many outdoor pools have hard water, which contains minerals like calcium and magnesium that leave residue behind. Very high calcium hardness levels can lead to cloudy pool water.

"A sinkhole suddenly appeared, and all the pool's water was sucked down into it ... to compelling human interest stories. "This is a very unusual incident," a paramedic told the outlet.