Question: What Does Free Chlorine Mean On Test Strip?

What happens if free chlorine is too 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..

How do you increase free chlorine?

Raise the Level of Pool Chlorine Raising pool chlorine can be much easier than trying to lower chlorine levels. 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.

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 is the difference between total chlorine and free 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.

Does high chlorine affect pH reading?

High chlorine levels decrease the pH of your pool’s water, making it more acidic. The more acidic the water, the higher the likelihood of corrosion. This corrosion can affect metal piping, equipment, and the surface of your pool (tiles, liners, concrete, etc.).

What is a safe free chlorine level?

The Association of Pool and Spa Professionals recommends free chlorine levels be kept between 2.0 and 4.0 ppm. The Center for Disease Control recommends free chlorine stay above 1 ppm in pools and 3 ppm in hot tubs. The easiest way to check your chlorine levels is with test strips.

How do you balance free chlorine and total chlorine?

To determine the amount of non-chlorine shock you will need, you will need to do some math. You will need to subtract the free chlorine from the total chlorine and multiply that by the number of gallons in the pool divided by 10,000 then multiply by 2.

Is a chlorine level of 5 Safe?

Accurate Amounts No matter what type of chlorine system you choose to use for your pool, remember that the chlorine level should remain between 1.0 and 3.0 parts per million (ppm) to ensure a safe and healthy pool. If the levels are any higher, you may be at risk of swimmer’s itch and red eyes.

Why is my total chlorine high but free chlorine low?

To make sure your pool is sanitized, your free chlorine should remain higher than your combined chlorine. … 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.

Should total chlorine be higher 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. This is why it’s so important to test your pool water regularly.

Do I need chlorine if I use shock?

You do need to use both tabs and shock. Without tabs, the chlorine shock will dissipate quickly out of the water; without shock, the chlorine level will not get high enough to fully sanitize the water. You should aim to keep the chlorine level at between 1 and 3 ppm.

How long after shock can I add chlorine?

Heavy shocking with granular chlorine will generally require 24-48 hours before the chlorine level has dropped to safe swimming levels (below 5 ppm). Lithium and Non-Chlorine shock labels typically allow immediate swimming, but check the package label, to be sure.

Are chlorine tablets free chlorine?

Free chlorine is the chlorine that is available to combine with contaminants in the water to disinfect and sanitize the water. … Free chlorine to treat a pool can come in liquid form, tablet form or granular form. The only difference between these types is the material that is bonded with the chlorine.

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.

Why do I have no free chlorine?

One of the causes of a high chlorine demand is an excessive buildup of algae and phosphates. Although you’re adding chlorine to your water, bacteria or algae are overpowering the chemicals causing it not to show up on tests strips or in water kits. … As chlorine does its job, it is depleted in the process.

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.