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 answer, the drawings, every reading and every table on this page are worked for the values in these fields, and worked again as you type. The questions further down are answered for the example this page was published with.
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 |
| Pool Shock Calcium Hypochlorite 65% calcium hypochlorite 65.0% |
10.8 oz 307 g |
nothing else measured |
The manufacturer's own dose sentence reads: 10 fluid ounces per 10,000 gallons. The figures above are computed from the product's strength.
In steps, if you would rather
| To reach | Add | Total added |
|---|---|---|
| 1.0 ppm | 10.8 fl oz | 10.8 fl oz |
| 1.5 ppm | 10.8 fl oz | 0.67 qt |
| 2.0 ppm | 10.8 fl oz | 1.01 qt |
| 2.5 ppm | 10.8 fl oz | 1.35 qt |
| 3.0 ppm | 10.8 fl oz | 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
- raise How to raise Salt
- lower Lower pH
- raise Total alkalinity, and how to raise it
- raise Raise pH
- shock Shock the pool
- lower Total alkalinity, and how to lower it
- raise Stabiliser, and how to raise it
- raise Calcium hardness, and how to raise it
Updated September 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
- Pool Shock Calcium Hypochlorite 65% · https://pyrockchemical.com/products/pool-shock-calcium-hypochlorite-65-for-sale · 2026-09-17