12,000 gallon pool: how much of each chemical
A 12,000-gallon pool needs about 12 fl oz of 12.5% liquid chlorine per 1 ppm of free chlorine (FC).
Always follow your product’s label directions. Pool and spa chlorine, bromine, shock and algaecides are EPA-registered pesticides: use products labeled for pool or spa use, and don’t swim or soak until levels are within the limit on your product’s label. If this page and a label disagree, the label wins.
| Product | +1 ppm FC | +2 ppm FC | +5 ppm FC | +10 ppm FC |
|---|---|---|---|---|
| Pool liquid chlorine 12.5% | 12 fl oz363 mL | 25 fl oz727 mL | 61 fl oz1.82 L | 123 fl oz3.63 L |
| Pool liquid chlorine 10% | 15 fl oz454 mL | 31 fl oz908 mL | 77 fl oz2.27 L | 1.2 gal (154 fl oz)4.54 L |
| Household bleach 6% | 25 fl oz731 mL | 49 fl oz1.46 L | 124 fl oz3.66 L | 1.95 gal (247 fl oz)7.31 L |
| Household bleach 8.25% | 17 fl oz515 mL | 35 fl oz1.03 L | 87 fl oz2.57 L | 1.35 gal (174 fl oz)5.15 L |
| Cal-hypo 65% | 2.5 oz70 g | 4.9 oz140 g | 12.3 oz349 g | 1.55 lb699 g |
| Dichlor 56% | 2.9 oz81 g | 5.7 oz162 g | 14.3 oz406 g | 1.8 lb811 g |
| Trichlor 90% | 1.8 oz50 g | 3.6 oz101 g | 8.9 oz252 g | 1.1 lb505 g |
Liquid chlorine percent is the trade percent on pool chlorine jugs; bleach percent is by weight. Cal-hypo adds calcium. Dichlor and trichlor add stabilizer (CYA). To shock, follow the directions on your product’s label.
| Product | Change | Amount |
|---|---|---|
| Baking soda | TA +10 ppm | 1.7 lb763 g |
| Muriatic acid 31.45% | TA −10 ppm | 30 fl oz910 mL |
| Dry acid 93.2% | TA −10 ppm | 2.55 lb1.16 kg |
| Muriatic acid 31.45% | pH 7.8 → 7.5 (TA 100, CYA 40) | 11 fl oz341 mL |
| Dry acid 93.2% | pH 7.8 → 7.5 (TA 100, CYA 40) | 15.4 oz438 g |
| Soda ash | pH 7.2 → 7.5 (TA 80, CYA 30) | 1.1 lb504 g |
pH doses depend on your TA and CYA, so use the calculator for your numbers. Acid and pH-up amounts are rounded down.
| Product | Change | Amount |
|---|---|---|
| Stabilizer (CYA) | +10 ppm | 1.0 lb454 g |
| Stabilizer (CYA) | 0 → 40 ppm (new fill) | 4.0 lb1.82 kg |
| Calcium chloride 77% | CH +10 ppm | 1.45 lb654 g |
| Calcium chloride 77% | CH +50 ppm (one step) | 7.2 lb3.27 kg |
| Pool salt | 0 → 3,200 ppm (new fill) | 320 lb145.36 kg · 9 × 40 lb bags |
| Pool salt | +500 ppm | 50.1 lb22.71 kg |
| Model | Capacity (manufacturer) |
|---|---|
| Intex Ultra XTR Frame 24ft x 52in | 12,481 gal |
| Bestway APX 365 22ft x 52in | 10,668 gal |
| Bestway APX 365 31ft 4in x 16ft x 52in | 13,798 gal |
On this page (9 sections)
With 10% chlorine, it takes 15 fl oz, and with 6% bleach, 25 fl oz. This is also the size where a pound of stabilizer raises the stabilizer level (CYA) by almost exactly 10 ppm.
Quick answer: chlorine for a 12,000 gallon pool (depends on product)
From FC 1 to 4 ppm, add about 37 fl oz of 12.5% liquid chlorine, 46 fl oz of 10%, or 74 fl oz of 6% bleach. Dry options: about 7.4 oz of 65% cal-hypo or 5.3 oz of 90% trichlor. With stabilizer at 40 ppm, keep FC between 3 and 5 ppm.
Scaling a "per 10,000 gallons" label? Multiply by 1.2. A gallon of 12.5% chlorine adds about 10.4 ppm here and a gallon of 10% about 8.3 ppm, so one jug is a large correction, not a daily dose.
Dose table: chlorine by product for +1/+2/+5/+10 ppm
At +5 ppm the liquid products are 61 fl oz of 12.5%, 77 fl oz of 10%, and 124 fl oz of 6% bleach, almost a full gallon of bleach. At +10 ppm, the 10% chlorine dose is more than a gallon (1.2 gal). If you buy by price per jug, compare by ppm instead: the liquid chlorine calculator shows how much each jug is worth in your pool, including strength lost in storage.
Shock dose: multiply the label by 1.2
How much shock to use is set by your product's label. For a label written per 10,000 gallons, multiply by 1.2:
- Label says 1 gallon of liquid chlorine: about 1.2 gallons (154 fl oz)
- Label says 1 lb of cal-hypo: about 1.2 lb (19 oz)
- Label says 2 lb of a granular shock: about 2.4 lb
A 1 lb bag of 65% cal-hypo adds about 6.5 ppm of chlorine and about 4.6 ppm of calcium to 12,000 gallons. Stay out of the pool until chlorine falls back to the swim limit on the label (often 4 ppm). Steps: how to shock a pool.
pH and alkalinity: acid and baking soda
The acid dose for pH 7.8 to 7.5 in this pool depends on total alkalinity (TA) and stabilizer (CYA). With 31.45% muriatic acid:
- TA 100, CYA 40: about 11 fl oz
- TA 80, CYA 40: about 9.7 fl oz
- TA 120, CYA 40: about 13 fl oz
- TA 100, no CYA: about 9.1 fl oz
- TA 100, CYA 80: about 13 fl oz
The highest of these is about 50% more than the lowest, for the same pH change in the same pool. Fixed alkalinity doses: about 30 fl oz of muriatic acid lowers TA by 10 ppm, and about 1.7 lb of baking soda raises it by 10 ppm. Soda ash for pH 7.2 to 7.5 (TA 80, CYA 30) is about 1.1 lb. Use the muriatic acid calculator with your readings, and baking soda in a pool for raising TA.
Stabilizer, calcium, and salt
- Stabilizer: 1 lb per 10 ppm, 4 lb from 0 to 40 ppm, and about 7 lb from 0 to 70 ppm for a salt pool. Check with the stabilizer calculator.
- Calcium chloride (77%): 1.45 lb per 10 ppm; 7.2 lb for a +50 ppm step.
- Salt: 320.5 lb from 0 to 3,200 ppm. Eight 40 lb bags (320 lb) give about 3,195 ppm, so eight is enough for a new fill even though the list rounds up to nine. A +500 ppm top-up is about 50 lb. See the pool salt calculator.
Pools that hold about 12,000 gallons
- Intex Ultra XTR Frame 24 ft × 52 in: 12,481 gallons (fill level not stated), about 5% below its 13,198-gallon geometry at a 90% fill.
- Bestway APX 365 22 ft × 52 in: 10,668 gallons.
- Bestway APX 365 31 ft 4 in × 16 ft × 52 in: 13,798 gallons.
- A 15 × 30 ft above-ground oval with a 52 in wall: about 11,720 gallons by geometry (straight sides, 90% fill).
Of these, the Intex 24 ft round pool is closest: dosing it as 12,000 gallons is about 4% short, less than a test kit can detect for chlorine. More detail on the 24 ft round pool and 15 × 30 pool pages.
Calculator preset to this volume
The calculator above starts at 12,000 gallons. Adjust it to your pool's listed or measured volume, enter your test results, and it lists doses in order with wait times. Neighboring sheets: 10,000 gallons and 15,000 gallons.
Safety. Pre-dissolve calcium chloride in a bucket of pool water; it gets hot. Add acid to water, never water to acid, and keep acid and chlorine at least 30 minutes apart with the pump running. Always follow the product label. Poison Control: 1-800-222-1222.
FAQ
How much chlorine do I put in a 12,000 gallon pool?
About 12 fl oz of 12.5% liquid chlorine, 15 fl oz of 10%, or 25 fl oz of 6% bleach per 1 ppm. From FC 1 to 4, about 37 fl oz of 12.5%. See how much chlorine to add.
How much shock for a 12,000 gallon pool?
Multiply the "per 10,000 gallons" amount on your shock label by 1.2. So 1 gallon of liquid chlorine on the label becomes about 1.2 gallons, and 1 lb of cal-hypo becomes about 1.2 lb. Wait to swim until chlorine is back at or below the label's swim limit.
How much muriatic acid for a 12,000 gallon pool?
About 11 fl oz of 31.45% acid for pH 7.8 to 7.5 at TA 100 and CYA 40, from 9.1 to 13 fl oz depending on TA and CYA, and about 30 fl oz to lower TA by 10 ppm.
Sources
- Intex, Ultra XTR Frame 24 ft × 52 in product page, read 2026-09-29: intexcorp.com
- Bestway, APX 365 22 ft × 52 in product page, read 2026-09-29: bestwayusa.com
- Bestway, APX 365 31 ft 4 in × 16 ft × 52 in product page, read 2026-09-29: bestwayusa.com
- Hayward, How much salt to add: hayward.com
- Formulas and reference checks: methodology