Can Free Chlorine Be Higher Than Total Chlorine?

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..

What happens if free chlorine 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.

Is 10 ppm chlorine dangerous?

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.

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.

Does too much chlorine make your pool cloudy?

An excessive amount of pool chemicals can cause your water to be cloudy. That includes: high pH, high alkalinity, high chlorine or other sanitizers, and high calcium hardness. One of the only ways to immediately know what chemicals you’ve overused in your pool is through the pHin mobile app.

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.

Whats the difference between total chlorine and free chlorine?

Total chlorine is the total amount of chlorine in the water. When chlorine binds up with contaminants it forms a compound called “chloramines” that are still part of the total but no longer effective. The chlorine that is still active to remove contaminants is known as free.

What happens if free chlorine is high?

Pools will naturally gas-off chlorine from the surface, and very high levels can irritate airways and lungs when inhaled for prolonged periods, especially indoor pools. At chlorine levels over 10 ppm, swimsuits can begin to fade, and pool covers become damaged, and it may be unhealthy for swimmers.

What does free chlorine mean on a test strip?

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.

How do I get more free chlorine in my pool?

Simply adding chlorine in the form of chlorine tablets, granular chlorine, liquid shock or powder shock will increase the total amount of chlorine within the pool.

What level of chlorine is dangerous?

Safe chlorine levels range between 1 and 3 parts per million. At concentrations above 6 ppm, the pool is unsafe.

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.

Will raising pH lower chlorine?

Extreme pH changes can also affect how the chlorine works in your pool. Chlorine works most efficiently in water with a neutral pH level between 7.4-7.6. … If you’re continuing to struggle with balancing the alkaline and acid in your pH levels, lower your pH levels by adding sodium bisulfate or muriatic acid.

How much chlorine does it take to raise 1 ppm?

Parts per million (ppm) is calculated by weight. One ppm is equal to 1 pound of chlorine in 1 million pounds of water. One million pounds of water is approximately 120,000 gallons. Converting to ounces, (1 pound = 16 ounces) 1 ounce of chlorine in 7,500 gallons equals 1 ppm.

What is the maximum level of free chlorine?

5 mg/LThe maximum allowable WHO value for free chlorine residual in drinking water is 5 mg/L. The minimum recommended WHO value for free chlorine residual in treated drinking water is 0.2 mg/L. CDC recommends not exceeding 2.0 mg/L due to taste concerns, and chlorine residual decays over time in stored water.

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.

How long does it take for chlorine levels to go down?

about two hoursDecrease pool chlorine with natural sunlight On a cloudless sunny day, 90% of the chlorine level in a pool can be destroyed in about two hours.

Why are my chlorine levels 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.