What Happens If You Don’t Put Chlorine In A Pool?

Chlorine sounds bad and harmful, a chemical that is dangerous to dive into. But that is a misconception. If not, why is it found in essential products like salt, PVC, and drinking water?

What happens if you don’t put chlorine in a pool? Having a “chlorine-free” pool sounds good and “natural.” But if there is no other form of sanitation used, your pool would be at significant risk.

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Read on to know the functions of chlorine in a pool. Find out what will happen if you don’t put chlorine in a pool.

Why Is Chlorine Used In A Pool?

For over a century, chlorine has been used to sanitize water—drinking water and pooling water. For pools, it also acts as an oxidizer and algaecide. Chlorine kills bacteria and algae. That is why pool owners shock the pool with some chlorine to take care of the green water. It can also hold a residual value in water.

These functions are needed to maintain a safe and bacteria-free pool. Chlorine is one of the extremely few chemicals that meet all of these functions while still being safe for exposure. Being an effective and inexpensive water disinfectant, chlorine is the choice for most pool owners.

What Happens If You Don’t Chlorinate A Pool?

If you previously chlorinated your pool but decided to stop for some reason, the available chlorine would fall dramatically in a week or two mainly if it’s used a lot, and the weather is hot. You’ll eventually notice green spots appear, and your pool gets cloudy.

If you shock your pool without chlorine, it will get very cloudy you can barely see-through. After a few months, your pool water would end up to be murky green. And of course, it would smell bad. There will be dark green patches everywhere; the fill outlets would be plugged, and the water level will drop.

Along with the algae, bacteria such as salmonella and E.coli would grow and build a community in the water. Unsanitized pools, unusually public and commercial ones, are risks for the health.

Related Questions

1. What can I utilize as an alternative for chlorine?

Bromine is like chlorine, but far more expensive and less popular. Baquacil, an oxidizer, can also be used, but it cannot adequately hold a residual value in the water, not recommended as a “stand-alone” for pool water maintenance.

Saltwater pools may need a little amount of chlorine if the natural process lags. You can regularly drain and replace your pool water entirely, but it would be costly and laborious.

2. Is there a disadvantage of using chlorine?

Chlorine pools require regular water testing and maintenance. Chlorine may produce chloramines that can irritate the eyes and skin and may create a strong odor. Chlorine is safe, but it requires careful and proper handling.


While its importance could be easily overlooked, chlorine is a key ingredient for a safe, appealing, and healthy swimming pool though “chemical-free,” untreated pool water can be unsafe. Also, it can pose a health risk to people.

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