In a 5,000 gallon pool, 6.4 fl oz (189 mL) of 10% liquid chlorine raises free chlorine by 1 ppm. The usual evening top-up from 2 to 6 ppm (CYA 40) takes 26 fl oz (757 mL). With 12.5% chlorine use 5.1 fl oz per ppm; with 8.25% bleach, 7.3 fl oz.
| Free chlorine | 10% | 12.5% | 8.25% bleach | 6% bleach |
|---|---|---|---|---|
| Raise 1 ppm | 6.4 fl oz | 5.1 fl oz | 7.3 fl oz | 10 fl oz |
| Raise 2 ppm | 13 fl oz | 10 fl oz | 15 fl oz | 21 fl oz |
| Raise 3 ppm | 19 fl oz | 15 fl oz | 22 fl oz | 31 fl oz |
| Raise 4 ppm | 26 fl oz | 20 fl oz | 29 fl oz | 0.32 gal |
| Raise 5 ppm | 32 fl oz | 26 fl oz | 0.28 gal | 0.4 gal |
| Shock 2 → 16 ppm | 0.7 gal | 0.56 gal | 0.79 gal | 1.1 gal |
Add
26fl oz
of Liquid chlorine 10%
3.2 cups757 mL
Raises free chlorine from 2 ppm to 6 ppm in 5,000 gal. Best added at dusk.
Check the product label. Strengths vary by brand, so enter the % printed on yours. Add one chemical at a time, into the water, and never mix chemicals.
With CYA at 40 ppm: minimum free chlorine 3 ppm, target 6 ppm, shock level 16 ppm. FC/CYA chart
Save this test and get reminded when it is time to retest.
Pool Calc for iPhoneComing soon to the App StoreLiquid chlorine adds almost nothing but chlorine. As it is used up it leaves a little salt behind (about 1.6 ppm per ppm of chlorine), which is harmless. It loses strength in storage, faster in a hot garage, so buy it fresh and keep it shaded.
Your target depends on your stabilizer (CYA). At CYA 40 the minimum is 3 ppm and the daily target about 6 ppm. At CYA 60 those become 4.5 and 7.5 ppm. Shocking at CYA 40 means holding 16 ppm, which takes 0.7 gal (2.6 L) from 2 ppm in this pool.
Never pour chlorine and acid together or in the same spot. Add one, run the pump for 30 minutes, then add the other.
That is about the size of a 15 ft round × 52 in above-ground pool (about 5,070 gal), or a 16 ft round × 48 in above-ground pool (about 5,260 gal). At 5,000 gallons, most doses are measured in fluid ounces or ounces rather than gallons or pounds. Above-ground pools of this size usually have vinyl liners, so keep calcium hardness modest and add everything in front of a return jet, away from the liner wall.
About 6.4 fl oz of 10% liquid chlorine per 1 ppm of free chlorine. To go from 2 to 6 ppm, add 26 fl oz.
At CYA 40 the shock level is 16 ppm. From 2 ppm that is 0.7 gal of 10% liquid chlorine. Higher CYA needs more: the shock level is 40% of CYA.
Yes, if it is plain unscented bleach. It is weaker, so use more: 7.3 fl oz of 8.25% bleach per ppm in 5,000 gallons.