Pool salt calculator: how much salt to add

Doses checked 11/10/2026

Worked out from the Indiana Department of Health's general rule for a pure chemical (its guide doesn't name salt), about 0.083 lb of salt raises salt by one ppm in 10,000 US gallons; Pentair's own salt table agrees. The calculator works out the total, gives you about three quarters to add now, and asks you to run the pump 24 hours before you retest. Use the salt level in your own salt system's manual.

Checked on every build: 17 tests of the sums this calculator runs, including 3 amounts printed in published charts, labels and manuals (ours must match them, or land under them where we start low on purpose) and 4 tests of its limits: caps, smaller rounds, and the cases where it gives no amount.

Read before you add anything

Never add acid and chlorine at the same time, and never mix them, even in a bucket or feeder. Mixing chlorine products with acid can create toxic gas. Add one, let the pump run, retest, then add the other.
Always add the chemical to water, never water to the chemical.
Add one chemical at a time. Never mix chemicals together, and use a separate clean scoop for each.
Add chemicals only when nobody is in the pool.
Wear the protective gear your product label asks for, such as goggles and gloves.
Handle chemicals in a well-ventilated area.
Add acid with the pump running, into the deep end, away from the skimmer and away from any floater or feeder that holds chlorine tablets.
Never add shock (cal-hypo or any other chlorine product) through the skimmer, or through any floater or feeder that holds or has held tablets, and never put different chlorine products in the same feeder.
Only pre-dissolve a chemical in a bucket if its label tells you to.
Store chemicals in a secure place away from children and pets, and never store liquid chemicals above dry chemicals.
Read the product label before each use. If the label differs from this estimate, follow the label.
These amounts are estimates. Add in stages and retest before adding more.
This tool cannot tell you the water is safe to swim in. Follow your product label, and if in doubt ask a pool professional.

Where each line comes from

CDC, Using Pool Chemicals Safely Official: “Never mix / Chlorine products with acid; this could create toxic gases” Source page (opens in a new browser tab)
12.5% liquid chlorine label, EPA-accepted Other source: “Mixing this product with chemicals (e.g. ammonia, acids, detergents, etc.) or organic matter (e.g. urine, feces, etc.)” ... “will release chlorine gas which is irritating to eyes, lungs and mucous membranes.” Source page (opens in a new browser tab)
CDC Official: “add pool chemical to water; NEVER add water to pool chemical” and “violent (potentially explosive) reaction can occur” Source page (opens in a new browser tab)
Virginia Department of Health Official: “Add chemicals to water - not water to chemicals.” Source page (opens in a new browser tab)
Indiana Department of Health Official: “Add acids to water, NEVER water to acid. Remember AAA (Always Add Acid).” Source page (opens in a new browser tab)
CDC Model Aquatic Health Code 2024, 5.9.3.4.2.3.1 Official: “Two or more chemicals shall never be mixed in the same dilution water.” Source page (opens in a new browser tab)
Indiana Official: “Never mix any chemicals together.” Source page (opens in a new browser tab)
Virginia Official: “Designate tools per chemical - Do not use the same scoop for different chemicals.” Source page (opens in a new browser tab)
MAHC 5.9.3.4.1.2 Official: “Chemicals added manually directly into the AQUATIC VENUE shall only be introduced in the absence of BATHERS.” Source page (opens in a new browser tab)
Virginia Official: “NEVER add pool chemicals when the pool is in use, and only add them poolside as directed by the product label.” Source page (opens in a new browser tab)
CDC, Using Pool Chemicals Safely Official: “Dress for safety by wearing appropriate safety equipment (for example, safety goggles, gloves, and mask)” Source page (opens in a new browser tab)
12.5% liquid chlorine label, EPA-accepted Other source: “Wear safety glasses or goggles and rubber gloves when handling this product.” Source page (opens in a new browser tab)
Alliance Trading pH Down (dry acid) label Other source: “Wear goggles or safety glasses and rubber gloves when handling this product.” Source page (opens in a new browser tab)
CDC, Using Pool Chemicals Safely Official: “Handle in a well-ventilated area” Source page (opens in a new browser tab)
Leslie's muriatic acid Other source: “With the pump running, pour the solution into the deep end of your pool, or away from the skimmer or any fixtures.” Source page (opens in a new browser tab)
Alliance Trading pH Down label Other source: “To add this product, broadcast into the deep end of the pool when not in use.” and “Do not add near metal fittings nor allow pH to drop below 7.2.” Source page (opens in a new browser tab)
CDC Official: “Never mix / Chlorine products with acid; this could create toxic gases” Source page (opens in a new browser tab)
UConn Health, Connecticut Poison Control Center, "Splish Splash Safety" Other source: “Keep acids away from other chemicals.” Source page (opens in a new browser tab)
Alliance Chemical 12.5% sodium hypochlorite safety data sheet Other source: “Never mix with acids, ammonia or other cleaning products: this releases toxic chlorine or chloramine gas.” Source page (opens in a new browser tab)
HTH Pool Care Shock, calcium hypochlorite 52% Other source: “Do not use this product in a floater or feeder.” Source page (opens in a new browser tab)
HTH 3" Chlorine Tabs Advanced Other source: “Do not use this product in floaters or feeders that have been used with other chlorinating products.” and “Do not use with any other tablets or sticks in the same skimmer, floater, or feeder.” Source page (opens in a new browser tab)
BioGuard cal-hypo label, EPA-accepted Other source: “Do not add this product to any dispensing device containing remnants of any other product.” Source page (opens in a new browser tab)
CDC Official, under “Never mix”: “Different pool chemicals (for example, different types of chlorine products) with each other or with any other substance” Source page (opens in a new browser tab)
CDC Official: “Only pre-dissolve pool chemicals when directed by product label” Source page (opens in a new browser tab)
Virginia Official: “Store chemicals in secure location away from children and pets.” Source page (opens in a new browser tab)
Virginia Official: “Never store liquid chemicals above dry chemicals.” Source page (opens in a new browser tab)
CDC Official: “Read chemical product label before each use” Source page (opens in a new browser tab)
Yakima County chart Official: “NOTE: This chart gives approximate amounts of each chemical listed. Always read the labels for exact” / “amounts needed for your chemical adjustments.” Source page (opens in a new browser tab)
Licking County Official: “Always follow instructions on the manufactures label for exact dosage amounts and handling.” Source page (opens in a new browser tab)
Multnomah County Official: “It is always better to add part of the required amount of chemical over several occasions” ... “than all at once (EXCEPTION: breakpoint chlorination).” Source page (opens in a new browser tab)
Indiana Official: “Add large amounts gradually in thirds over a 2-hour period.” Source page (opens in a new browser tab)
Our own rule for every result: we point you to your label and the official guidance instead.

What is a salt water pool?

A salt pool has a salt chlorine generator, which makes the pool's chlorine from salt dissolved in the water. The generator's manual gives the salt level it needs.

Which salt level?

Makers differ, so use your own system's manual. Hayward's manual says The ideal salt level is between 2700-3400 ppm (parts per million) with 3200 ppm being optimal. Pentair's says 3600 - 4500 ppm (ideal 3600 ppm). Leave the target empty and the calculator uses 3,200 ppm. Above 4,500 ppm, the top of the ranges we found, it sends you to a pool professional.

How much salt

The Indiana Department of Health gives a general rule for any pure chemical, without naming salt: 1.0 ppm equals about .083 lbs of chemical per 10,000 gallons of water* or 1.3 oz per 10,000 gallons**. Pentair's own table works out within a fraction of a percent of that; we use the smaller figure. The calculator gives about three quarters of the total first, because pool volumes are estimates and salt can only be removed by draining.

For example, say your pool holds 20,000 US gallons and salt reads 2,400 ppm. To reach 3,200 ppm the calculator estimates 132 lb in all, and says to add 99 lb now, about 2.4 bags of 40 lb, then run the pump and retest.

How to add salt

Check your salt system's manual for the salt level and for whether to switch the system off. Pentair's manual says: “Do not add any pool water balancing chemicals (including salt) unless the IntelliChlor SCG is switched off.”
Make sure nobody is in the pool.
Pour the salt around the edge of the pool, not into the skimmer, and brush it.
Run the pump, as Hayward's manual says: Run the filter pump for 24 hours with the suction coming from the main drain (use pool vac if there is no main drain).
Retest salt and work out the rest from the new reading.

New plaster pools

Wait before adding salt. Hayward's manual says For new plaster pools, wait 10-14 days before adding salt to allow the plaster to cure. If you tick new plaster, the calculator holds the salt step back.

Questions people ask

How much salt does my pool need?

Enough to reach the level in your salt system's manual. Worked out from a health department's general rule, about 0.083 lb raises salt by one ppm in 10,000 US gallons; the calculator does the sum for your pool size and reading.

What salt level should a salt pool have?

The one in your system's manual. Hayward gives 2,700 to 3,400 ppm and Pentair 3,600 to 4,500 ppm.

What chlorine level should a salt pool have?

The salt system makers give their own: Pentair's manual says 2.0 - 4.0 ppm. Hayward's says chlorine tests will show the desired 1-3ppm free chlorine reading. The calculator aims for at least 2 ppm, or more with stabilizer, never above 4 ppm.

How do I lower the salt in my pool?

Only by draining part of the water. Talk to a pool professional before draining: draining can damage some pools.

How long after adding salt can I swim?

We couldn't find a published figure for this. Follow your product's label, or ask a pool professional.

Add this calculator to your site

Put this code in your own page's HTML. The calculator runs the same sums as this page and links back to us.

Code to copy

<iframe src="https://addtomypool.com/poolside/pool-salt-calculator/" title="Pool salt calculator" loading="lazy" width="100%" height="1500"></iframe>
<p>Calculator from <a href="https://addtomypool.com/pool-salt-calculator/">Add to My Pool</a></p>

The charts behind this page

Show all 13 figures and where each one comes from

Each figure this page and its calculator use. Open one for the source's own words, the other sources we checked it against, and the checks it has been through.

Ideal free chlorine range (home pool target band): 2–4 ppm Official
Licking County Health Department (Ohio): Pool and Spa Water Chemistry Adjustment Guide Official says: Free Chlorine (ppm) 1 2-4 N/A (recommended not higher than 5) Source page (opens in a new browser tab)
Also checked: Oregon Health Authority: Water Quality Standards, OAR 333-062-1000 (public pools) Official says: Free Chlorine (w/CYA) 2.0ppm 2.0-4.0ppm 10.0ppm Source page (opens in a new browser tab)
Also checked: Pentair IntelliChlor IC15/20/40/60 Installation and User's Guide, P/N 520589 Rev R Other source says: 2.0 - 4.0 ppm. Source page (opens in a new browser tab)
Also checked: HTH 3" Chlorine Tabs Advanced product page Other source says: Add one tablet per 10,000 gallons of pool water every week, or as often as needed, to maintain a free available chlorine level of 1–4 ppm. Source page (opens in a new browser tab)
Also checked: Hayward AquaRite Owner's Manual 092538 RevD Other source says: chlorine tests will show the desired 1-3ppm free chlorine reading. Source page (opens in a new browser tab)
Also checked: Arkansas Department of Health Official says: Pool* 1.0 1.0 – 3.0 5.0 Source page (opens in a new browser tab)
Also checked: Maryland Department of Health Official says: Free Chlorine 1.5 ppm 2.0 ppm – 3.0 ppm 10.0 ppm Source page (opens in a new browser tab)
Checked against the source on 11/10/2026. Re-opened by a second checker on 11/9/2026, who matched the source's words to this figure.
Free chlorine above which chlorine labels say do not swim (re-entry level): 4 ppm Other source
EPA-accepted label: B's Pool Supply Sodium Hypochlorite Solution 12.5% (EPA Reg. 55487-20001) Other source says: SWIMMING POOL WATER DISINFECTION – Do not reenter pool with a chlorine level above 4 ppm for risk of bodily harm. Source page (opens in a new browser tab)
Also checked: EPA-accepted label: BioGuard Master Calcium Hypochlorite 67% (Bio-Lab, EPA Reg. 5185-238) Other source says: Reentry into treated swimming pool is prohibited above levels of 4 ppm chlorine due to risk of bodily injury. Source page (opens in a new browser tab)
Also checked: EPA-accepted label: PDQ ChlorSan 8% Sodium Hypochlorite (EPA Reg. 58880-2) Other source says: Reentry into treated pools is prohibited above levels of 4.0 ppm due to risk of bodily harm. Source page (opens in a new browser tab)
Also checked: HTH Pool Care Shock product page Other source says: Do not enter the pool until free available chlorine levels return to 1–4 ppm. Source page (opens in a new browser tab)
Also checked: EPA-accepted label: Tarry trichlor 8 oz tablets/sticks (Qualco, EPA Reg. 3525-120) Other source says: Re-entry into treated swimming pools/spas is prohibited above levels of 3.0 ppm. Source page (opens in a new browser tab)
Also checked: EPA-accepted label: Tarry trichlor 8 oz tablets/sticks (Qualco, EPA Reg. 3525-120) Other source says: Do not enter pool until the chlorine residual drops to 2.0 ppm (parts per million). Source page (opens in a new browser tab)
Also checked: CDC Model Aquatic Health Code, 5th edition (2024), Code Official says: Maximum DPD-FC concentrations shall not exceed limits specified on the product label. Source page (opens in a new browser tab)
Checked against the source on 11/9/2026. Re-opened by a second checker on 11/9/2026, who matched the source's words to this figure. Looked up again on 11/10/2026 by a checker who couldn't see our figure: it came back with the same figure.
Salt level for Hayward AquaRite salt chlorine generators: 2,700–3,400 (best 3,200) ppm Other source
Hayward AquaRite Owner's Manual 092538 RevD Other source says: The ideal salt level is between 2700-3400 ppm (parts per million) with 3200 ppm being optimal. Source page (opens in a new browser tab)
Checked against the source on 11/9/2026. Re-opened by a second checker on 11/9/2026, who matched the source's words to this figure.
Salt level for Pentair IntelliChlor salt chlorine generators: 3,600–4,500 (best 3,600) ppm Other source
Pentair IntelliChlor IC15/20/40/60 Installation and User's Guide, P/N 520589 Rev R Other source says: 3600 - 4500 ppm (ideal 3600 ppm) Source page (opens in a new browser tab)
Checked against the source on 11/9/2026. Re-opened by a second checker on 11/9/2026, who matched the source's words to this figure.
Default salt target in the calculator (user can change it to their generator's figure): 3,200 ppm Other source
Hayward AquaRite Owner's Manual 092538 RevD Other source says: The ideal salt level is between 2700-3400 ppm (parts per million) with 3200 ppm being optimal. Source page (opens in a new browser tab)
Also checked: Pentair IntelliChlor IC15/20/40/60 Installation and User's Guide, P/N 520589 Rev R Other source says: 3600 - 4500 ppm (ideal 3600 ppm) Source page (opens in a new browser tab)
Checked against the source on 11/9/2026. Re-opened by a second checker on 11/9/2026, who matched the source's words to this figure.
Salt: lb to raise salt 1 ppm in 10,000 US gal: 0.083 lb per ppm per 10,000 US gal Official (worked out)
Worked out: from Indiana's general rule for any 100% chemical (the guide does not name salt); Pentair's salt table agrees (0.0834).
Indiana Department of Health: Adjusting Chemical Levels in a Swimming Pool / Water Chemistry Adjustment Guide Official says: 1.0 ppm equals about .083 lbs of chemical per 10,000 gallons of water* or 1.3 oz per 10,000 gallons**. Source page (opens in a new browser tab)
Also checked: Pentair IntelliChlor IC15/20/40/60 Installation and User's Guide, P/N 520589 Rev R Other source says: Table 2 (10,000 US gal, target 3,600 ppm): current 0 -> 300.43 lb; 1,000 -> 216.98 lb; 2,000 -> 133.53 lb Source page (opens in a new browser tab)
Checked against the source on 11/9/2026. Re-opened by a second checker on 11/9/2026, who matched the source's own words quoted here.
Run the pump after adding salt: 24 hours Other source
Hayward AquaRite Owner's Manual 092538 RevD Other source says: Run the filter pump for 24 hours with the suction coming from the main drain (use pool vac if there is no main drain) Source page (opens in a new browser tab)
Also checked: Hayward AquaRite Owner's Manual 092538 RevD Other source says: The salt display may take 24 hours to respond to the change in salt concentration. Source page (opens in a new browser tab)
Checked against the source on 11/9/2026. Re-opened by a second checker on 11/9/2026, who matched the source's words to this figure.
New plaster pools: wait before adding salt: 10–14 days Other source
Hayward AquaRite Owner's Manual 092538 RevD Other source says: For new plaster pools, wait 10-14 days before adding salt to allow the plaster to cure. Source page (opens in a new browser tab)
Checked against the source on 11/9/2026. Re-opened by a second checker on 11/9/2026, who matched the source's words to this figure.
Salt: wait before swimming: no published figure found Not confirmed
We couldn't find a published figure for this. Follow your product's label, or ask a pool professional.
Closest we found: Virginia Department of Health says NEVER add pool chemicals when the pool is in use, and only add them poolside as directed by the product label. Source page (opens in a new browser tab)
US gallon to liters: 3.785412 L per US gal Official
NIST Special Publication 811, Appendix B.8 conversion factors Official says: gallon (U.S.) (gal) | liter (L) | 3.785 412 | E+00 Source page (opens in a new browser tab)
Checked against the source on 11/9/2026. Re-opened by a second checker on 11/9/2026, who matched the source's words to this figure.
US fluid ounce to milliliters: 29.57353 mL per US fl oz Official
NIST Special Publication 811, Appendix B.8 conversion factors Official says: ounce (U.S. fluid) (fl oz) | milliliter (mL) | 2.957 353 | E+01 Source page (opens in a new browser tab)
Checked against the source on 11/9/2026. Re-opened by a second checker on 11/9/2026, who matched the source's words to this figure.
Ounce (avoirdupois) to grams: 28.34952 g per oz Official
NIST Special Publication 811, Appendix B.8 conversion factors Official says: ounce (avoirdupois) (oz) | gram (g) | 2.834 952 | E+01 Source page (opens in a new browser tab)
Checked against the source on 11/9/2026. Re-opened by a second checker on 11/9/2026, who matched the source's words to this figure.
Pound to kilograms: 0.4535924 kg per lb Official
NIST Special Publication 811, Appendix B.8 conversion factors Official says: pound (avoirdupois) (lb) | kilogram (kg) | 4.535 924 | E-01 Source page (opens in a new browser tab)
Checked against the source on 11/9/2026. Re-opened by a second checker on 11/9/2026, who matched the source's words to this figure.