Too Much Salt in the Pool? How to Lower the Salt Level
The exact gallons and inches to drain, in stages that spare the pool surface.
High salt won’t go away on its own. Salt doesn’t evaporate, so the fix is swapping some pool water for fresh. Do it in stages: Hayward advises lowering the water no more than 6 inches at a time.
Enter your gallons (or measure the pool), your test reading and your salt system. You get the share of water to drain, in gallons and inches, to reach that system’s manual target. The drain is split into stages no deeper than the limit you set.
Example · Above the Hayward AquaRite range
Example: a 19,150-gallon pool on a Hayward AquaRite. Type your own numbers.
Drain and refill about 5,532 gallons (28.9% of the water), about 17.3 inches of water level, to bring the pool from 4,500 to 3,200 ppm. In stages of up to 6 inches that becomes 4 stages and 19.5 inches in total (6,215 gallons), because each stage drains water that is already diluted. No chemical removes salt.
- gallons to drain
- 5,532
- liters
- 20,942
- % of the water
- 28.9
- inches, one drain
- 17.3
Vinyl liner? One drain this size replaces more than half the water. Latham says never to remove more than half a vinyl liner pool's water, so drain in stages and refill between them.
Staged plan, recomputed after each refill
| Stage | Lower by | Salt before | After refill | Running total |
|---|---|---|---|---|
| 1 | 6.0 in | 4,500 ppm | 4,050 ppm | 6.0 in · 1,915 gal |
| 2 | 6.0 in | 4,050 ppm | 3,645 ppm | 12.0 in · 3,830 gal |
| 3 | 6.0 in | 3,645 ppm | 3,281 ppm | 18.0 in · 5,745 gal |
| 4 | 1.5 in | 3,281 ppm | 3,200 ppm | 19.5 in · 6,215 gal |
MathFraction to replace = (current − target) ÷ (current − refill salt). Each stage recomputes the salt level after the refill.
Hayward?Between 3,400 and 3,600 ppm Hayward's chart gives no instruction; a small drain is optional.
Below target?Below your target instead? The salt dose calculator gives the pounds to add.
The procedure
How to lower the salt level in a pool in 6 steps
Lower the salt in rounds: calculate the drain, drain one stage, refill, circulate, retest, and repeat until the reading is back inside your brand's range.
Calculate the drain. Enter your pool’s gallons, or its average depth and dimensions (the pool volume calculator works these out). Add your confirmed reading and your salt system. If your refill water has salt in it, enter its reading; otherwise leave it at 0. You’re done with this step when you have the total gallons, the inches to lower and a first stage. If the calculator says no drain is needed, stop here.
Three pool types have a drain limit to check before the first stage.
- Vinyl liner pools: Liner maker Latham says a vinyl liner pool should never be completely drained, and you should never remove more than half its total water volume. A 6-inch stage in a pool averaging 54 inches deep is about 11% of the water.
- Pools with a Hayward AquaRite: Hayward's AquaRite Troubleshooting Guide (TSG-AQR159d) recommends lowering the water no more than 6 inches at a time before refilling, and warns that going further “may result in damage to the pool structure or surface.”
- Above-ground pools: we couldn’t find a manufacturer drain limit for these. Follow the manual for your pool.
Drain one stage. Lower the water line by the stage the calculator shows. Its stages stay within Hayward’s 6-inch limit. Measure from a fixed mark such as the tile line or the top of the wall. On a Jandy with a DE filter, the manual’s code 145 remedy starts with a backwash, which takes out some water by itself. You’re done when the water line is down by the stage amount.
Refill with fresh water. Bring the water back to its normal operating level.
Circulate. Run the pump so the fresh water mixes through the whole pool. No manufacturer says how long. The 24-hour dissolving time in the Pentair and Jandy manuals is for added salt, not a refill.
Retest. Once the pool has circulated, retest with the same independent test you used to confirm the reading, so the numbers compare.
Repeat with a recomputed stage. Enter the new reading and take the next stage the calculator gives. Don’t split the original total into equal parts; the staged-draining section below shows why. Stop when the reading is inside your brand’s range and the light or code clears:
- Pentair: the light returns to solid green;
- Jandy: the reading returns to 3.0–3.5 g/L;
- Hayward: the High Salt light goes out;
- CircuPool: the High Salt light goes out (from CircuPool's support answers);
- Intex: Code 92 disappears.
If you overshoot and drop below your range, add salt back. The pounds for the new reading are on how much salt to add to a pool.
Before you drain
How much salt is too much in a pool?
Salt is too much when it sits above your own salt system’s range. Pool guides put the top of the usual range at 3,400 ppm. The manuals set the top anywhere from 3,400 ppm (Hayward AquaRite) to 4,500 ppm (Pentair IntelliChlor green band). If you’re inside your brand’s range, do nothing. A drain costs water and the salt you already paid for.
Ask “is 4,000 ppm too high?” and each manufacturer in the table below gives a different answer.
| Salt system | Manufacturer's range | High-salt signal and what the system does | At 4,000 ppm |
|---|---|---|---|
| Pentair IntelliChlor (IC15–IC60) | Green light at 2,800–4,500 ppm; 3,600 recommended (3,400 in the guide's table of contents and Spanish section) | Flashing green above 4,500 ppm, with a warning of corrosion to equipment and surfaces | Not too high: inside the green band |
| Jandy AquaPure / PureLink | 3.0–3.5 g/L (3,000–3,500 ppm) | Code 145 “High Salinity” above 4.0 g/L. “HH” means too high to measure, and the cell turns off | Too high for the target, and right at the 4.0 g/L line; code 145 and the power-center warning apply above it |
| Hayward AquaRite | Chart: 3,200 Ideal, 3,400 OK, 3,600 and above Dilute. The S3 high-salt alarm defaults to 3,400 (adjustable). Between 3,400 and 3,600 Hayward gives no instruction; a small drain is optional | Classic AquaRite: a solid High Salt light shuts down all chlorine production. S3: a warning at the alarm setting | Too high: in the chart's Dilute row |
| Intex Saltwater System with E.C.O. (ECO5110/6110) | 2,500–3,500 ppm; 3,000 optimal | Code 92 means high salt | Too high: above the band |
| CircuPool Universal | About 3,000–4,000 ppm (from published excerpts; the manual could not be reviewed) | A solid High Salt light means no chlorine is generated | At the top of an unconfirmed band: check your manual |
Three of these systems stop making chlorine at high salt: the classic Hayward AquaRite with a solid High Salt light, the CircuPool Universal with a solid High Salt light, and a Jandy showing “HH.” While that light or code is on, the pool gets no new chlorine from the salt cell. Jandy goes further in its AquaPure / PureLink Power Center and Cell Kit installation and operation manual (H0325600 Rev F): “Operating with high salt will damage the power center.”
For the full targets and panel lights, see the salt level chart by brand.
Test first
Why confirm a high salt reading before you drain?
The panel number can be wrong, so check it with a separate test before you drain anything. Pentair rates its own sensor at ±500 ppm, per the Pentair IntelliChlor Installation and User's Guide (P/N 520589 Rev. R). The guide adds that strips, electronic testers and titration can each give a different reading.
Then check the cell setting. Before diluting, Hayward’s troubleshooting guide says to test with a calibrated meter and check the programmed cell type. CircuPool’s support answers say the same for the Universal: confirm high salt with separate tests and check the “Cell Version” setting. One answer shows a panel reading of 6,200 ppm against a water test of 3,200 ppm and points to a wrong Cell Version setting. A setting change fixed it.
To pick a test, with each method’s stated error, see how to test the salt level.
The math
Why does staged draining take more water?
A staged drain uses more water in total than one big drain. After the first stage, each new drain takes out water that’s already partly diluted, so every inch removes less salt.
For a single drain, Hayward’s troubleshooting guide gives a “Proportional Method”: (average depth in inches × 3,200) ÷ actual salt, subtracted from the average depth. For a pool averaging 54 inches at 4,500 ppm, that’s 54 − (54 × 3,200 ÷ 4,500) = 15.6 inches. The calculator uses the same math, but it opens on a 60-inch pool, so its inches differ from Hayward’s 54-inch example. The table drains Hayward’s example pool in 6-inch stages (our calculation, assuming vertical walls and full mixing).
| Stage | Water line lowered | Salt before | Salt after refill |
|---|---|---|---|
| 1 | 6.0 in | 4,500 ppm | 4,000 ppm |
| 2 | 6.0 in | 4,000 ppm | 3,556 ppm |
| 3 | 5.4 in | 3,556 ppm | 3,200 ppm |
| Total | 17.4 in |
Staged, the drain takes 17.4 inches against 15.6 for a single drain, about 12% more water. Those extra 1.8 inches are the cost of staying under Hayward’s 6-inch limit. That’s why the calculator recomputes each stage from your retest. Three equal 5.2-inch stages, a third of 15.6 inches each, would stop short of 3,200.
Of the manuals we reviewed, Hayward’s 6 inches is the only stage limit in English. Pentair’s English troubleshooting table gives no interval; its Spanish section says one foot at a time.
Refill water
What if your refill water has salt?
Salty refill water means you drain more. By default, the calculator assumes your refill water has no salt. If it has some, the fraction of pool water to replace is:
(C − T) ÷ (C − S)
C is the current reading, T is the target, and S is the salt in the refill water, all in ppm. To go from 4,500 to 3,200 ppm with refill water at 300 ppm, replace 31.0% of the water instead of 28.9%. If you don’t know your refill water’s salt level, test it with the same method you use on the pool.
How it works
How does draining lower the salt level?
Draining works by dilution. You swap some salty water for fresh, and the salt level falls in proportion to the share of water you replace. No chemical takes salt out of pool water. Salt is measured in ppm (parts per million), the number your test strip, meter or control panel shows. Jandy panels show g/L instead; multiply by 1,000 to get ppm, so 3.5 g/L is 3,500 ppm.
The calculator tells you how much to drain. Whether to drain at all depends on your brand’s range, and draining without damaging the pool depends on the drain limits for your pool type.
Owner questions
Questions about lowering pool salt
Answers come from the makers’ own documents. Where a document is silent, we say so.
Is 4,000 ppm salt too high?
Usually yes: 4,000 ppm is above the 2,700–3,400 ppm range that pool guides commonly give. Each manual answers for its own system. On a Pentair IntelliChlor, 4,000 ppm is inside the 2,800–4,500 green band. On a CircuPool it’s at the top of the 3,000–4,000 ppm range from a published manual excerpt, so check your CircuPool manual. On a Jandy AquaPure it’s above the 3.0–3.5 g/L target and right at the 4.0 g/L line; code 145 applies above that line. On a Hayward AquaRite it’s in the chart’s 3,600+ Dilute row, and on an Intex ECO it’s above the 2,500–3,500 band.
Can you lower pool salt without draining?
No. Salt leaves the water only through splash-out, backwash or draining, per Hayward’s S3 manual. A backwash does take out a little salt, along with the water.
How much water should I drain?
With salt-free refill water, a single drain replaces 12.5% to 25% of the water for the four common high readings below.
- 4,000 → 3,500 ppm: 12.5% of the water;
- 4,000 → 3,200 ppm: 20%;
- 4,600 → 3,600 ppm: 21.7%;
- 4,000 → 3,000 ppm: 25%.
Intex’s ECO5110/6110 manual says to drain and refill about 20% until Code 92 disappears. That alone takes 3,750 ppm down to 3,000. Staged drains add to these totals; the calculator gives your exact gallons and inches.