# Question: What Happens If Free Chlorine Is Low?

## Does shock increase 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..

## 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 total chlorine be less than free chlorine?

If the Total Chlorine in your pool is higher than the Free Chlorine reading, then the difference between the two represents the level of Combined Chlorine in the water. If the readings are the same, then no Combined Chlorine is present. The Total Chlorine level cannot be less than the Free Chlorine level.

## How do you balance free chlorine and total chlorine?

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. To make it easy it looks like this: (TC-FC) x (#of gallons/10,000) x 2 = amount of non-chlorine shock.

## 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 you shock a pool with bleach?

Now you can know the gallons of bleach you would need to shock your pool as follows: use 0.5 gallons of Clorox per 10K gallons of water to increase the level of chlorine by 5 ppm. If you want to raise the level of chlorine by 2.5 ppm, then you would need ¼ gallon of the product per 10K gallons of water.

## How do you raise low free chlorine in pool?

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.

## Why is my chlorine 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.

## What’s 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 should my free chlorine level be?

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.

## Is shock the same as chlorine?

Shock is chlorine, in a high dose, meant to shock your pool and raise the chlorine level quickly. … Chlorine tabs (placed in a chlorinator, floater, or skimmer basket) maintain a chlorine residual in the water. You do need to use both tabs and shock.

## Why is my total chlorine high but free chlorine low?

So, to answer the question, if your Total Chlorine is high but Free Chlorine is low, it is an indication that the hot tub requires a shock treatment. This can be done by adding your weekly dose of an oxidizer like Beachcomber CareFree, Mineraluxe Oxygen or Beachcomber Ultra Shock.

## How long can pool water sit without chlorine?

24-48 hoursIf you are not adding chlorine to kill bacteria, the pool should be drained every other day. Stagnant water without chlorine, can become unhealthy water in just 24-48 hours.

## 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.

## 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.

## How long after shock can I add chlorine?

Waiting to swim after shocking. Follow package instructions, which will guide you in how long to wait after shocking before swimming. Heavy shocking with granular chlorine will generally require 24-48 hours before the chlorine level has dropped to safe swimming levels (below 5 ppm).

## Why is my free chlorine low?

Things that cause low free chlorine levels are excessive sunlight, high bather loads, and improper water chemistry. Not having enough chlorine in your swimming pool will also cause the little bit of chlorine that’s in there to be used up faster too.

## Is it safe to swim if free chlorine is low?

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.