Why did my pool water turn purple?

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The purple staining is caused when the pool water has formed something called copper cyanurate. Copper cyanurate occurs when excessive levels of cyanuric acid combine with non-chelated copper that is present in the water. This problem is most common in pools that have cyanuric acid levels measuring above 100ppm.

Also Know, why did my pool water turn black? The colors may vary from green, red, brown, purple or black. The reason behind this color change usually indicates the presence of minerals (metals) in your swimming pool. The chlorine added to the swimming pool oxidizes the metals and will cause a chemical reaction that becomes visible in your swimming pool.

In this way, how do I get rid of purple in my pool?

How to Get Rid of Purple Stains in a Swimming Pool

1. Place a half-pound of pH reducer powder in a white sock.
2. Raise the water level in your pool until it is above all the stains.
3. Add muriatic acid.
4. Brush the stains away once a day for two consecutive days.
5. Clean the filter.
6. Add two to three doses of mineral treatment after all the stains have disappeared.

Why does pool water look blue?

The molecules in pool water absorb light from the red end of the spectrum when sunlight falls on the water. By removing the red, the light which ends up being reflected has a slightly blue hue which can vary in richness by water depth.