Quick Answer: Why Is My Chlorine So Low?

What is 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..

Is free chlorine the same as chlorine?

Free chlorine involves the amount of chlorine that’s able to sanitize contaminants, while combined chlorine refers to chlorine that has combined directly with the contaminants. Total chlorine is basically the sum of free chlorine and combined chlorine.

How do you fix low free chlorine?

Lower the Level of Pool Chlorine It is much more difficult to reduce the amount of total chlorine within an above ground swimming pool than it is to increase it. One of the only ways bring it down is to leave your pool uncovered and in direct sunlight. Sunlight eats away the total chlorine within the pool.

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.

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 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.

What do you add to pool when pH is low?

If your pool’s pH tested below 7.2, add 3-4 pounds of baking soda. If you’re new to adding pool chemicals, start by adding only one-half or three-fourths of the recommended amount. After retesting, you can always add more if the level is still low.

Does shock raise free chlorine?

Free chlorine is just that, free. … Shocking then releases the combined chlorine and off-gasses the contaminants, increasing the amount of free chlorine in your pool or spa. The question of whether to use a chlorinated or non-chlorinated shock will depend on how much total chlorine you have in your pool or spa.

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.

Can total chlorine be lower than free chlorine?

If the total chlorine level is higher than the free chlorine level, the difference of the two is the combined chlorine level. In order for your pool to be properly sanitized, the free chlorine level must remain higher than the combined chlorine level.

Why is there no free chlorine 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.