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Why does pool water look blue?

Updated: 12/13/2022
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The water is reflecting the blue sky.

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Q: Why does pool water look blue?
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Do calcium components really change the color of water to blue?

No. Other than blue dye or food coloring (including the coloring that is in some pool chemicals), nothing adds a blue color to the water. So, why does the water in a white pool look blue? The water absorbs the shorter wavelengths of light (the red range) first. The longest wavelengths - the blue range - travel much deeper. (Any scuba diver knows that everything looks blue in deeper water) In your pool, that blue light is reflected back from the bottom of the deep end, giving the whole pool that distinctive blue color! With that in mind, anything which enhances water clarity, allowing more light to get through, will enhance the blue color!


What does a pool with light gray plaster look like?

---- Water colors will change according to angle, distance and light. White, black, grey and blue plaster colors will give different shades of blue water reflections. Tan plaster colors will reflect green water. Green plaster colors will vary between emerald and blue. A light grey plaster color will be light blue grey on the steps and in the shallowest part of the pool. It will become a darker blue as the water gets deeper.In two words -"Gorgeous" and "Inviting"!


On a map what color is for water?

When you look into an ocean or a lake, the water looks like it's blue. But, up close, water isn't really blue. It's only blue when you look at it in big groups, (like an ocean or a lake, a pond etc.), because the sky is blue, so the color of the sky makes a blue reflection on the water, making it look blue. So, on a map, if you drew water as clear, nobody would be able to tell there was anything there at all! So, water on a map is drawn blue instead.


Should you tie the pool water leveler to the water softener?

You can, if the water presently in the pool is 'hard' - but be very careful to keep an eye on the Calcium Hardness of the pool water. If you filled a pool with water from the softener, the water would be hungry for calcium and drag it out of the pool walls, making them feel and look like sandpaper. Calcium hardness should be kept within 200-275ppm. best to use regular water for topup and keep the pool water properly balanced (see your local pool store).


Are there any chemicals to find out who urinated in the pool?

Actually yes, there is. You'd have to go to a pool store, but there is something you can put in the water so if someone urinates the water turns a bright blue around them. Although irritating when someone is too lazy to urinate in the toilet and uses your pool that's on of the reasons why you have chlorine in your pool. I know how irritating it is when pool guest urinate in the pool. I tell all my pool guest I don't swim in your toilet, don't pee in my pool!

Related questions

Does a beige pool bottom make the water look blue?

A beige pool bottom will not make the water look blue. This is because the beige will reflect off the water making it look brown.


How do different color liners affect blueness of pool water?

The pool water draws its color from the liner. If you buy a white liner, then the pool water will not be blue. If you use a light blue liner, then the pool will be light blue. In my opinion, the best liner is a darker blue liner with ripples on it. Your pool will look gorgeous and inviting and the ripple effect makes it difficult to see any dirt in your pool. A solid color liner lets you see everything, which isn't always pretty.


Do calcium components really change the color of water to blue?

No. Other than blue dye or food coloring (including the coloring that is in some pool chemicals), nothing adds a blue color to the water. So, why does the water in a white pool look blue? The water absorbs the shorter wavelengths of light (the red range) first. The longest wavelengths - the blue range - travel much deeper. (Any scuba diver knows that everything looks blue in deeper water) In your pool, that blue light is reflected back from the bottom of the deep end, giving the whole pool that distinctive blue color! With that in mind, anything which enhances water clarity, allowing more light to get through, will enhance the blue color!


What color is the water supposed to be in a salt water pool?

same color as a regular pool - blue


What colour does red litmus paper change when in pool water?

Blue!! Because pool water is alkaline and alkalis turn red litmus paper into blue.


You heard new pool water is green and turns blue in a few days is this true?

You have to treat pool water with pool chemicals and use a pool filter to get and keep the water clear.


Why is Swimming pool water sky blue chlorine is 3.0 pH is 7.4?

The Sodium bicarbonate (glorified baking soda) in the water turns your pool water blue. You should maintain 80 to 120 ppm to keep your pool nice and blue. David James Whatley, Jr. Owner of Sky-Blue Pools in Naples, Florida.


What colour is pool water?

really purple but looks blue


Pros and cons of medium gray pool?

It gives the pool a different look than standard white. It can also be splotchy and mottled. It will not make the water warmer. This is purely and aesthetic choice. I particularly like the way 8 oz. of blue and 2 oz. of black gives the water a tropical look.


What does a pool with light gray plaster look like?

---- Water colors will change according to angle, distance and light. White, black, grey and blue plaster colors will give different shades of blue water reflections. Tan plaster colors will reflect green water. Green plaster colors will vary between emerald and blue. A light grey plaster color will be light blue grey on the steps and in the shallowest part of the pool. It will become a darker blue as the water gets deeper.In two words -"Gorgeous" and "Inviting"!


How do you prevent hair from turning green from pool water?

Do not use blue (copper) algecide. If you have already added too much blue algecide in the past, the only way to remove it is to buy a metal remover at your pool supply or do a partial drain and refill of the pool water. Pool Masters


Clorine was added but pool water is still sky blue?

Chlorine*