Quick Answer: What Does Free Chlorine Mean On A Test Strip?

What happens if free chlorine is low?

When the chlorine level is too low, microorganisms like bacteria are able to multiply faster.

With harmful bacteria like e-coli, this will quickly cause your pool to be unhealthy, risking any swimmers potentially getting sick.

Algae growth.

Algae will also grow quickly..

Is high free chlorine harmful?

Exposure to high levels of chlorine can cause lung irritation, skin and eye damage, and provoke asthma. Not only is it bad for your health, but it can be bad for your pool due to the increase in chlorine. High chlorine levels decrease the pH of your pool’s water, making it more acidic.

Will Shock raise free chlorine?

“Shocking” refers to the process of adding chlorine or non-chlorine chemicals to your pool in order to raise the “free chlorine” level. The goal is to raise it to a point where contaminants such as algae, chloramines and bacteria are destroyed. … The odor actually comes from chloramines, also known as combined chlorine.

How much shock Do I need to raise free chlorine?

The goal of shocking your pool is to raise the free chlorine level of your pool water to roughly 10 times the combined chlorine level of your pool water.

Is it safe to swim in a pool with low free chlorine?

Anything between 5-10 ppm is still safe to swim, but you are risking damage to equipment and certainly complaints from swimmers. Some experts recommend no swimming unless the chlorine is 8 ppm or less. You need to make sure your water is first balanced before expecting an effective sanitizing program using chlorine.

Why can’t I get a free chlorine reading in my pool?

If you test your pool water and can’t get a chlorine level reading at all it may be due to a very high chlorine demand. … Contamination, low pH or low chlorine stabiliser levels could cause this situation. The water might appear cloudy, the pool walls be slimy or the pool may look relatively OK.

How do I calculate free chlorine in my pool?

To properly measure free chlorine in your pool, use a FAS-DPD test kit and make sure that the free chlorine is between 1.0 and 3.0 parts per million (ppm).

How high does chlorine need to be to shock a pool?

5-10 ppmCombined chlorine (or chloramines) are ineffective in breaking down harmful bacteria and undesirable organisms. Shocking a pool elevates the free chlorine level to 5-10 ppm. Elevated levels of free chlorine break up combined chlorine.

Does shocking pool raise pH?

Chlorine based pool shock (Calcium Hypochlorite) has a high pH, and will naturally raise the pH level of your swimming pool water, in addition to changing your chlorine level. Chlorine free shock has a neutral pH, and will not affect any of your pool chemical levels.

Can you shock a pool two days in a row?

Will the children swim again? Here’s the deal. It’s pretty tough to over-shock your pool; shocking your pool two days in a row with the proper dosage for your pool volume shouldn’t be a problem – and in fact, is sometimes even needed to rid your pool of algae and other contaminants.

Why is my total chlorine high but free chlorine low?

This occurs when too much stabilizer is added to the water or when the swimming pool isn’t being partially drained and refilled periodically. Chlorine lock can also occur if the pH is unbalanced. The quickest way to determine if a chlorine lock is present is to perform a test for total chlorine and free chlorine.

Should total chlorine and free chlorine be the same?

Put It All Together. If total and free chlorine levels are the same, there’s no combined chlorine in your water, meaning none of it has been used up yet. … In order for your pool to be properly sanitized, the free chlorine level must remain higher than the combined chlorine level.

What do I do if my free chlorine pool is low?

If your total chlorine level is high, you will use a non-chlorine shock; if it is low, you will use a chlorinated shock. As a rule, you will need to raise free chlorine to 10 times your combined chlorine to hit what is known as “break point.” Therefore, it is good to deal with combined chlorine while it is still small.

Can I add shock and chlorine at the same time?

Yes, you can add both shock and chlorine to a pool. However, you should not add them at the same time. The best thing to do is to shock your pool first. Then, once the chlorine levels go down to a certain threshold, you can add more chlorine.

Why is my chlorine level so low?

Sometimes, it’s just a simple case of pool owners adding too much stabilizer to the water. Sometimes this occurs when you aren’t partially draining and refilling your pool periodically. Adversely, very little or zero stabilizer also creates a demand for chlorine.

How often should a pool be shocked?

It’s often recommended to shock your pool once a week. If you don’t do it every week, you should at least do it every other week. This is necessary to maintain your pool’s water chemistry. If you have a lot of people over in your pool or have a party, you may want to shock your pool more frequently.

What does free chlorine mean?

Free chlorine refers to the amount of chlorine that has yet to combine with chlorinated water to effectively sanitize contaminants, which means that this chlorine is free to get rid of harmful microorganisms in the water of your swimming pool.