Raise free chlorine
Into 21,100 gal of water, add
1.69qt 1.59LHASA CHLOR — sodium hypochlorite, 12.5%. Free chlorine from 0.5 ppm to 3.0 ppm.
Your pool
The quantity, the drawing, every product row and every step on this page are worked again as you type.
Every product that does this
| Product | Add | Also moves |
|---|---|---|
| HASA CHLOR sodium hypochlorite 12.5% |
1.69 qt 1.59 L |
nothing else measured |
| Multi-Chlor sodium hypochlorite 12.5% |
1.69 qt 1.59 L |
nothing else measured |
| Cal Hypo 68% Granular Pool Shock calcium hypochlorite 68.0% |
10.3 oz 293 g |
nothing else measured |
The HASA CHLOR label says: “10 fluid ounces per 10,000 gallons”.
In steps, if you would rather
Split into 5 equal steps of 10.8 fl oz each: add one, run the pump, and test again before the next.
| To reach | Total added |
|---|---|
| 1.0 ppm | 10.8 fl oz |
| 1.5 ppm | 0.67 qt |
| 2.0 ppm | 1.01 qt |
| 2.5 ppm | 1.35 qt |
| 3.0 ppm | 1.69 qt |
Where the band comes from
| Source | Range |
|---|---|
| Florida 64E-9.004 (1)(d)2 conventional pool |
1.0–10.0 ppm |
| Florida 64E-9.004 (1)(d)2 spa or hot tub |
2.0–5.0 ppm |
| Florida 64E-9.004 (1)(d)2 indoor pool |
up to 5.0 ppm |
| CDC Healthy Swimming stabilised pool |
2.0 and up ppm |
Pool and spa rules are adopted and amended state by state, and most of the ranges here are written for public pools. Confirm every figure against the code your jurisdiction has adopted and against your own product label.
Other adjustments
Updated October 2026
Sources and dates
Ranges are quoted from the code named beside them, product strengths from the manufacturer's own product page, each retrieved on the date shown.
- Florida 64E-9.004 (1)(d)2 · http://flrules.elaws.us/fac/64e-9.004 · 2026-09-17
- HASA · https://hasa.com/pool-chemical-calculator · 2026-09-17
- CDC Healthy Swimming · https://www.cdc.gov/healthy-swimming/about/home-pool-and-hot-tub-water-treatment-and-testing.html · 2026-09-17
- HASA CHLOR · https://hasa.com/product/hasachlor · 2026-09-17
- Multi-Chlor · https://hasa.com/products/ · 2026-09-17
- Cal Hypo 68% Granular Pool Shock · https://pyrockchemical.com/products/pool-shock-calcium-hypochlorite-65-for-sale · 2026-10-01
This site publishes calculated water volumes and chemical quantities for home pool and spa owners. It is not a health, safety or professional service, and it does not replace the instructions printed on the product you are holding. Not affiliated with, endorsed by or sponsored by HASA, Pyrock Chemical, Pentair, Hayward, Sonoma Hot Tubs, the Centers for Disease Control and Prevention, or any state health department. Product names are the trademarks of their owners and appear here only to identify the strength of what is in the container.