We use
PoolMath to calculate chemical doses.
And the amount of chlorine required depends on your CYA level. See
FC/CYA Levels and
Recommended Levels
How much liquid chlorine also depends on the % strength you bought.
From
Liquid Chlorine - Further Reading
When using liquid chlorine you need to calculate how much liquid chlorine poured into your size pool will give you the desired amount of
Free Chlorine as measured in Parts Per Million (PPM). This takes some calculating and we have a free app called
Pool Math to do these calculations for you.
The strength of liquid chlorine depends on where you buy it and it's intended use. Household bleach can be found with chlorine strengths from 4% to 6%. Pool Chlorinating liquid sometimes called "Liquid Pool Shock" can be found in strengths from 10% to 12%. The label on the jug will tell you the % of
Sodium Hypochlorite.
If you need to get an estimate of the amount of water in your pool you can use the calculator at the bottom of the old
Pool math web page. You simply enter the pool dimensions and average depth and it gives you the gallons of water in the pool.
Pentair has a
Pool Volume Calculator that lets you select from rectangular, oblong, round, and triangle shapes.
Finally, you need to estimate your daily chlorine consumption. An average pool in the summer in full sun will consume 3 to 4 ppm of chlorine from the suns UV rays. In the Spring and Fall chlorine consumption will decrease due to the lower sun angle.
If you are unsure, then begin with adding 3 to 5 ppm of liquid chlorine daily as calculated by
Pool Math. Your pump should be running when adding any chemicals and let your pump run for at least 30 minutes after adding the liquid chlorine.
Then test your
Free Chlorine daily using your
pool test kit. If your free chlorine is increasing above your target then reduce the daily quantity of liquid chlorine added. If your free chlorine is decreasing then increase the daily quantity of liquid chlorine added. Within a few days you will know your pools daily chlorine usage and how much liquid chlorine is required.
For example, with a 10,000 gallon pool, adding 40 ounces of 10% liquid chlorine will raise the free chlorine by 3.1 ppm. If 5% liquid chlorine is used it will require 70 ounces of liquid chlorine to add 3 ppm of free chlorine.
Our
Recommended Levels page will help you determine the correct
Free Chlorine and other pool water chemistry levels for your pool.
