8,000 gallon pool: how much of each chemical
To raise free chlorine (FC) by 1 ppm in an 8,000-gallon pool, add about 8.2 fl oz of 12.5% liquid chlorine.
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% | 8.2 fl oz242 mL | 16 fl oz485 mL | 41 fl oz1.21 L | 82 fl oz2.42 L |
| Pool liquid chlorine 10% | 10 fl oz303 mL | 20 fl oz606 mL | 51 fl oz1.51 L | 102 fl oz3.03 L |
| Household bleach 6% | 16 fl oz488 mL | 33 fl oz975 mL | 82 fl oz2.44 L | 1.3 gal (165 fl oz)4.88 L |
| Household bleach 8.25% | 12 fl oz343 mL | 23 fl oz686 mL | 58 fl oz1.72 L | 116 fl oz3.43 L |
| Cal-hypo 65% | 1.6 oz47 g | 3.3 oz93 g | 8.2 oz233 g | 1.05 lb466 g |
| Dichlor 56% | 1.9 oz54 g | 3.8 oz108 g | 9.5 oz270 g | 1.2 lb541 g |
| Trichlor 90% | 1.2 oz34 g | 2.4 oz67 g | 5.9 oz168 g | 11.9 oz336 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 | 1.1 lb508 g |
| Muriatic acid 31.45% | TA −10 ppm | 20 fl oz606 mL |
| Dry acid 93.2% | TA −10 ppm | 1.7 lb779 g |
| Muriatic acid 31.45% | pH 7.8 → 7.5 (TA 100, CYA 40) | 7.6 fl oz227 mL |
| Dry acid 93.2% | pH 7.8 → 7.5 (TA 100, CYA 40) | 10.3 oz292 g |
| Soda ash | pH 7.2 → 7.5 (TA 80, CYA 30) | 11.8 oz336 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 | 10.7 oz303 g |
| Stabilizer (CYA) | 0 → 40 ppm (new fill) | 2.65 lb1.21 kg |
| Calcium chloride 77% | CH +10 ppm | 15.4 oz436 g |
| Calcium chloride 77% | CH +50 ppm (one step) | 4.8 lb2.18 kg |
| Pool salt | 0 → 3,200 ppm (new fill) | 214 lb96.91 kg · 6 × 40 lb bags |
| Pool salt | +500 ppm | 33.4 lb15.14 kg |
| Model | Capacity (manufacturer) |
|---|---|
| Intex Ultra XTR Frame 18ft x 52in | 6,981 gal |
| Intex Ultra XTR Frame 20ft x 48in | 7,947 gal |
| Intex Rectangular Ultra XTR Frame 24ft x 12ft x 52in | 8,403 gal |
| Bestway APX 365 24ft x 12ft x 52in | 7,937 gal |
On this page (9 sections)
With 10% chlorine, it takes 10 fl oz, and with 6% bleach, 16 fl oz. Two 24 ft × 12 ft × 52 in frame pools from different brands are listed 466 gallons apart, so "same size" does not always mean the same dose.
Quick answer: chlorine for an 8,000 gallon pool (depends on product)
A top-up from FC 1 to 4 ppm takes about 25 fl oz of 12.5% liquid chlorine, 31 fl oz of 10%, or 49 fl oz of 6% bleach. With dry products, about 4.9 oz of 65% cal-hypo or 3.6 oz of 90% trichlor. Hold 3–5 ppm FC when stabilizer (CYA) is 40 ppm.
Two numbers are easy to remember at this size: a gallon of 10% chlorine adds 12.5 ppm, and a gallon of 12.5% adds about 15.6 ppm. Half a gallon of 12.5% (64 fl oz) is a +7.8 ppm dose, a good size for recovering after a busy weekend.
Dose table: chlorine by product for +1/+2/+5/+10 ppm
The table lists seven products. At +10 ppm, 12.5% liquid chlorine is 82 fl oz and 6% bleach is 1.3 gallons. Among dry products, 65% cal-hypo is about 1.6 oz per ppm, 56% dichlor 1.9 oz, and 90% trichlor 1.2 oz. Remember that cal-hypo raises calcium, and dichlor and trichlor raise CYA, with every dose. For jugs that have been sitting in the sun, the liquid chlorine calculator corrects for lost strength.
Shock: use 0.8 of your label's dose
Read the shock dose from your product's label. If it is written per 10,000 gallons, use 0.8 of it for 8,000 gallons. Example with liquid chlorine: a label that says 1 gallon per 10,000 gallons means about 102 fl oz here, which leaves about 26 fl oz in the jug.
With 65% cal-hypo, a 1 lb bag adds about 9.7 ppm of chlorine and about 7 ppm of calcium to 8,000 gallons. A label of 1 lb per 10,000 gallons scales to about 13 oz. Wait to swim until chlorine is at or below the label's swim limit, often 4 ppm. The full routine is in how to shock a pool.
pH and alkalinity: acid and baking soda
For pH 7.8 to 7.5 when total alkalinity (TA) is 100 and CYA is 40, add about 7.6 fl oz of 31.45% muriatic acid or 10.3 oz of dry acid. At TA 80 the same change needs about 6.4 fl oz; at TA 120, about 8.9 fl oz.
- Lower TA by 10 ppm: about 20 fl oz of muriatic acid.
- Raise TA by 10 ppm: about 1.1 lb of baking soda (baking soda in a pool).
- Raise pH 7.2 to 7.5 (TA 80, CYA 30): about 11.8 oz of soda ash.
Put your own TA and CYA into the muriatic acid calculator for the exact acid dose.
Stabilizer, calcium, and salt
- Stabilizer: 10.7 oz per 10 ppm; 2.65 lb from 0 to 40 ppm (stabilizer calculator).
- Calcium chloride (77%): 15.4 oz per 10 ppm; 4.8 lb for a +50 ppm step.
- Salt: about 214 lb from 0 to 3,200 ppm. Five 40 lb bags give about 3,000 ppm; the sixth bag on the shopping list covers the rest and later top-ups. A +500 ppm top-up is 33.4 lb. See the pool salt calculator.
Tablets and stabilizer buildup. If trichlor tablets supply all your chlorine and the pool loses 1 ppm a day, you use about 8.3 oz of trichlor a week. That adds about 4.2 ppm of CYA every week, so a pool that opens at CYA 40 reaches 80 in about 10 weeks, and only draining brings it down. The chlorine tablet calculator projects this for your pool.
Pools that hold about 8,000 gallons
| Model | Listed capacity | Geometry at 90% fill |
|---|---|---|
| Intex Rectangular Ultra XTR Frame 24 ft × 12 ft × 52 in | 8,403 gal | 8,402 gal |
| Bestway APX 365 24 ft × 12 ft × 52 in | 7,937 gal | 8,402 gal |
| Intex Ultra XTR Frame 20 ft × 48 in | 7,947 gal (fill not stated) | 8,460 gal |
The two 24 × 12 × 52 pools have the same nominal size, yet Intex lists 5.9% more water than Bestway. The Intex number matches simple rectangle geometry at a 90% fill; Bestway's is 5.5% lower. For a 3 ppm top-up with 12.5% chlorine, that is about 26 fl oz versus 24 fl oz. The 12 × 24 pool page covers the oval and inground versions of this footprint.
Calculator preset to this volume
The calculator above is set to 8,000 gallons. Type in your model's listed capacity, then your readings, and it returns a step-by-step plan. Neighboring sheets: 7,000 gallons and 10,000 gallons.
Safety. Store tablets, shock, and acid apart, in closed containers, out of reach of children. Never put different products in the same feeder or bucket, and never mix chlorine with acid. Always follow the product label. Poison Control: 1-800-222-1222.
FAQ
How much chlorine do I put in an 8,000 gallon pool?
Per 1 ppm: 8.2 fl oz of 12.5% liquid chlorine, 10 fl oz of 10%, or 16 fl oz of 6% bleach. From FC 1 to 4, about 25 fl oz of 12.5%. More on products in how much chlorine to add.
How much shock for an 8,000 gallon pool?
Take 0.8 of the "per 10,000 gallons" amount on your shock label. That turns 1 lb of cal-hypo into about 13 oz and 1 gallon of liquid chlorine into about 102 fl oz. Don't swim until chlorine is back at or below the label's limit.
How much muriatic acid for an 8,000 gallon pool?
About 7.6 fl oz of 31.45% acid for pH 7.8 to 7.5 at TA 100 and CYA 40, and about 20 fl oz to lower TA by 10 ppm.
Sources
- Intex, Rectangular Ultra XTR Frame 24 ft × 12 ft × 52 in product page, read 2026-09-29: intexcorp.com
- Bestway, APX 365 24 ft × 12 ft × 52 in product page, read 2026-09-29: bestwayusa.com
- Intex, Ultra XTR Frame 20 ft × 48 in product page, read 2026-09-29: intexcorp.com
- PHTA fact sheet, Dichlor (CYA added per ppm of chlorine): phta.org
- Formulas and reference checks: methodology