Saltwater Pool Conversion Cost Calculator
About a thousand dollars DIY for an average pool — itemized for your gallons — and an honest payback by your current chlorine spend. With the recurring-cell caveat most pages bury: saltwater is cheaper chlorine, not free chlorine.
Hook
About a thousand dollars to switch — but whether it's worth it is a different question.
Converting a chlorine pool to saltwater costs most people somewhere around a thousand dollars done themselves — a generator, a few hundred pounds of salt, and an afternoon's work — or several hundred more with a pro to wire it.
But the cost is only half the question. Whether it's worth it depends on how much you spend on chlorine now and how long you'll keep the pool, because a salt pool isn't free to run: the generator cell wears out every few years and needs replacing. Saltwater is cheaper chlorine, not free chlorine.
Promise
This calculator itemizes your conversion cost — the generator sized to your pool, the salt to charge it, and install — and then does the part most pages skip: an honest payback. Tell it what you spend on chlorine now, and it shows when the conversion pays for itself, factoring in the ongoing salt and the cell you'll replace down the road. A heavy chlorine spender recoups in a couple of years; a light user might never. It's the real decision, both halves.
Here's the deal: two numbers decide this. What the conversion costs you up front — the generator, the salt, the install — and what you save each year afterward, which is your current chlorine bill minus the salt and the slow cost of replacing the cell. So the more you currently spend on chlorine, the faster it pays back.
What you'll give us
Six inputs: pool volume, pump runtime, SWG unit price, salt price per bag, install (DIY or pro), and the harder one — your current chlorine spend per year. The diagram below shows how the engine turns them into the two result panels.
The calculator
Defaults match worked example 1 (20,000 gal, 12-hr pump, medium chlorine spend). Change them to your pool and your bill, or run the defaults first to see what the equal-weight cost-plus-payback result looks like.
We charge salt to 3200 ppm as the canonical operating target; ongoing maintenance after conversion is covered by the pool salt calculator.
Don't know your gallons? Pool volume calculator — two minutes, any shape, deep-links straight back here.
What the conversion costs (the breakdown)
The upfront cost has three parts. The biggest is the generator itself — the cell plus its power center — which runs from about seven hundred dollars for a small-pool unit to fourteen hundred for a large one; you size it to your pool the same way the salt chlorine generator calculator does.
Then the salt: to bring a fresh pool up to the level the generator needs (~3,200 ppm), you'll add a few hundred pounds — around thirteen to fourteen forty-pound bags for an average pool, maybe a hundred and twenty dollars. The lbs of salt is engine-exact (the same chemistry-engine function the pool salt calculator uses); the dollar figure is editable because salt prices vary.
Last is install: nothing if you do it yourself, since the cell plumbs into your existing return line, or a few hundred for an electrician to wire the power center.
When it pays for itself (the honest payback)
Now the half most pages skip. Your yearly saving isn't your whole chlorine bill — it's that bill minus what a salt pool costs to run, and a salt pool isn't free. You'll still buy a little salt each year, and the generator cell wears out in about five years and costs a few hundred to replace, which works out to maybe a hundred to two hundred dollars a year.
So the payback depends on what you spend on chlorine now: a heavy spender at eight hundred a year recoups the conversion in under two years; a medium spender in about three; a light user spending three hundred might take seven years — or never, if their chlorine bill barely beats the salt-pool running cost. Saltwater is cheaper chlorine, not free chlorine.
The shaded zone on the left is where the math stops working: below about two hundred dollars a year on chlorine, your savings are too small to recoup the conversion within a typical 5–15 year pool ownership horizon. That isn't a knock on saltwater — it's an honest read of the numbers. If you're in that zone, the non-cost reasons below are the right framing.
The reasons that aren't money (the honest other side)
Not everyone converts to save money, and the page would be dishonest to pretend otherwise. A lot of people switch for the feel — salt water is softer on skin and eyes, without the chlorine smell. Others do it to stop handling and storing jugs of liquid chlorine or buckets of tablets.
And a salt system sanitizes more steadily, since it makes chlorine continuously instead of in big manual doses. If those matter to you, the payback math is only part of the decision — sometimes the conversion is worth it even when the dollars are a wash.
Sizing and dosing it (the framing)
A conversion is really three of our tools working together. Sizing the generator — which cell for your pool and pump hours — is the salt chlorine generator calculator's job, and it sets the biggest line in your cost here. The initial salt charge, and keeping the salt right afterward, is the salt calculator. And the whole thing starts from your pool's volume, which drives both the salt and the generator size. Total the conversion here; let those handle the cell choice and the salt dose.
Practically: the salt-charge formula isn't rewritten in this page's module — it's the same massToShiftPpm function the pool salt calculator uses, imported from lib/dosing/core.ts. The assertion script grep-checks that no second 8.345 constant or salt formula gets declared here, so the two pages can't drift apart on the salt math.
Eight worked examples
Every figure below runs through the same lib/dosing/conversion.ts engine the calculator uses (which itself reuses the chemistry engine's salt-mass function), and is locked against the research-file precomputed values by assert-conversion.mjs.
E1 — Standard conversion cost (20k DIY, the core case)
20,000 gal at 12-hr pump → SWG (IC40 / T-15 class typical) $1,000 + salt charge (534 lb ≈ 13.4 bags ≈ $120.17) + DIY install $0 = $1,120.17 DIY ($1,520 with a pro).
Takeaway: An average pool converts for about eleven hundred dollars yourself, or fifteen-hundred-plus with an electrician.
E2 — The salt charge (reuses the salt engine)
20,000 gal to 3,200 ppm → 534.08 lb (= 13.35 forty-pound bags ≈ buy 14 bags) at $9/bag = $120.17charge cost ($126 at the register; the ~½-bag extra carries to top-ups).
Takeaway: The initial salt is a small part of the cost — about thirteen to fourteen bags for an average pool. Same massToShiftPpm engine the salt calculator uses (and the same one that handles your ongoing top-ups).
E3 — Payback, heavy chlorine spender
$1,120 conversion, current chlorine $800/yr, saltwater ongoing $150/yr → saves $650/yr → payback ~1.72 yr.
Takeaway: If you spend a lot on chlorine now, the conversion pays for itself in under two years.
E4 — Payback, light spender (the honest limit)
Same $1,120 conversion, current chlorine $300/yr, saltwater ongoing $150/yr → saves $150/yr → payback ~7.47 yr — and if your chlorine bill were lower, it might never recoup.
Takeaway: A light chlorine user may wait seven years or never break even — because the cell is a recurring cost. Saltwater is cheaper chlorine, not free.
E5 — The recurring-cell reality
The ~$300–700 cell every ~5 years (page-21 sourced) ≈ $60–140/yr amortized, plus salt top-ups ~$30–60/yr → $100–200/yr ongoing. That's the cost most cost-to-convert pages bury in a footnote.
Takeaway:Budget for replacing the cell every few years — it's the cost that turns “free chlorine” into “cheaper chlorine.”
E6 — Cost by pool size (DIY)
15k: SWG (IC20 / T-9 class $900) + salt $90.13 ≈ $990 DIY. 20k: ≈ $1,120. 30k: SWG (IC60 class $1,300) + salt $180.25 ≈ $1,480.
Takeaway: Bigger pool, bigger conversion — mostly the larger generator class and more salt.
E7 — DIY vs pro install
20k DIY ≈ $1,120 vs pro ≈ $1,520 (the typical $400 electrician for the power center).
Takeaway: Doing it yourself saves the install fee — the cell plumbs in easily, but wiring the power center is where people hire out.
E8 — Metric
75 m³ (~19,800 gal) → salt charge 529.08 lb (= 240.0 kg); total conversion ≈ $1,119 DIY.
Takeaway: Same components in metric — generator, salt, install.
Reference tables
T1 · Conversion cost by pool size (DIY + Pro)
Salt-charge MASS engine-exact (massToShiftPpm via lib/dosing/core.ts — same function the salt calculator uses). SWG unit-cost CLASS typical (editable in the calculator). Install: DIY $0 / Pro $400. Salt at $9/40-lb bag (decimal-bag cost). Released CC BY 4.0.
| Pool size | Matched cell | SWG class typical | Salt charge | Salt $ | DIY total | Pro total |
|---|---|---|---|---|---|---|
| 10,000 gal | IntelliChlor IC15 | $800 | 267 lb | $60 | $860 | $1,260 |
| 15,000 gal | TurboCell T-9 | $900 | 401 lb | $90 | $990 | $1,390 |
| 20,000 gal | IntelliChlor IC40 | $1,000 | 534 lb | $120 | $1,120 | $1,520 |
| 25,000 gal | IntelliChlor IC40 | $1,000 | 668 lb | $150 | $1,150 | $1,550 |
| 30,000 gal | IntelliChlor IC60 | $1,300 | 801 lb | $180 | $1,480 | $1,880 |
| 40,000 gal | — | $1,300 | 1068 lb | $240 | $1,540 | $1,940 |
T2 · Payback by current chlorine spend (the honest wedge)
At a typical $1,120 DIY conversion and $150/yr saltwater-ongoing cost. Annual savings = chlorine spend − saltwater ongoing. Below $50/yr savings (≈ $200/yr chlorine spend), the page surfaces “may not recoup” honestly. Released CC BY 4.0.
| Chlorine $/yr | Annual savings | Payback | Bracket |
|---|---|---|---|
| $200 | $50 | 22.40 yr | light |
| $300 | $150 | 7.47 yr | light |
| $400 | $250 | 4.48 yr | medium |
| $500 | $350 | 3.20 yr | medium |
| $600 | $450 | 2.49 yr | medium |
| $700 | $550 | 2.04 yr | heavy |
| $800 | $650 | 1.72 yr | heavy |
T3 · Traditional chlorine vs saltwater ongoing per year (the “cheaper not free” dataset)
The page's central honesty as a dataset: saltwater ongoing ($100–200/yr typical) is NOT zero — salt top-ups + amortized cell replacement at ~$300–700 every ~5 years (page-21 sourced cell life). Released CC BY 4.0.
| User type | Traditional chlorine $/yr | Saltwater ongoing $/yr | Annual saving |
|---|---|---|---|
| Light user | $300 | $100 | $200 |
| Typical user | $500 | $150 | $350 |
| Heavy user | $800 | $200 | $600 |
Tables released CC BY 4.0. T1 salt-charge mass is engine-exact; dollar figures throughout are editable street-price typicals (vary by retailer and region).
Methodology & sources
The conversion total has three line items: SWG unit + initial salt charge + install. Total ranges from about $730 DIY for a 15k pool to about $1,560 DIY for a 30k pool, with a pro electrician adding ~$300–500 on top.
The salt charge mass is engine-exact.It reuses the chemistry engine's massToShiftPpm function (from lib/dosing/core.ts, the same module the pool salt calculator uses) to compute the salt needed to raise 0 → 3,200 ppm in your pool. For a typical 20k pool: 534.08 lb of salt, which is about 13.4 forty-pound bags (you buy 14). The lbs is verified by assert-conversion.mjs and grep-checked to confirm no second 8.345 constant or salt-mass formula gets redeclared in the conversion module — the two pages cannot drift apart.
The salt cost uses decimal-bag math.Salt cost in the engine = lbs × $/lb (where $/lb = pricePerBag / 40), so the line item reflects the salt actually charged into the pool. You buy whole bags (14 in the standard 20k case = $126 at $9/bag); the half-bag extra carries to first-year top-ups and shouldn't inflate the conversion-cost decision. The cost panel displays both the engine value (~$120) and the at-register total (~$126).
The SWG unit cost is by class, sized from page 21. The matched cell from the SWG sizer (which considers your pool volume AND pump hours) drops into one of four cost classes — IC15/T-5 (~$800), IC20/T-9 (~$900), IC40/T-15 (~$1,000), or IC60 (~$1,300) — keeping the sourced manufacturer cell data in SWG_CELLS separate from editable commercial prices in conversion.ts. All dollar typicals are editable and labeled “typical street price, varies by retailer and region.”
The payback engine.Payback = conversion total ÷ annual savings. Annual savings = current chlorine spend − saltwater ongoing. Saltwater ongoing defaults to $150/yr, the typical of a $100–200/yr range: salt top-ups ($30–60/yr) plus amortized cell ($60–140/yr — page-21's sourced ~10,000-hour / ~$300–700 cell replaced every ~5 years). When annual savings fall below $50/yr, the engine returns paybackYears: null with bracket "may-not-recoup" — below that level, payback exceeds a typical 5–15 year pool ownership horizon, and the page says so honestly rather than pretending precision.
The recurring-cell caveat is the page's central honesty. Saltwater is cheaper chlorine, not free chlorine. Most competitor cost-to-convert pages bury the cell-replacement cost in a footnote or skip it entirely; this page surfaces it three ways at once: a non-dismissible banner above the result cards, the saltwater-ongoing input's visible explanation, and the floor line drawn on the payback SVG. The wedge isn't rhetorical — it's the structural difference between an honest payback and an optimistic one.
Honesty boundaries. Salt-charge mass is exact (the only hard number on the page). SWG class typicals, install, salt $/bag, chlorine spend, and saltwater-ongoing are all editable street-price estimates. Payback is bracketed by spend (heavy/medium/light/may-not-recoup), never a single false-precise figure. Non-cost reasons (softer water feel, no chlorine handling, steady sanitation) noted, not oversold.
Cross-page consistency. Chemistry-cluster salt-corner spoke, paired bidirectionally with /salt-chlorine-generator-calculator/ (size the unit ↔ total the conversion); cross-linked to /pool-salt-calculator/ (engine for the charge AND the ongoing top-up dose) and /pool-volume-calculator/ (the input that drives both salt and cell).
Reference tables released under CC BY 4.0. T1 salt-charge mass is engine-exact; dollar figures throughout are editable street-price typicals.
Frequently asked questions
- How much does it cost to convert a pool to saltwater?
About $1,120 done yourselffor an average 20,000-gallon pool — a salt cell power center sized to your pool (~$1,000 for an IC40-class unit), the initial salt charge to ~3,200 ppm (about 534 lb / 14 bags / ~$120), and zero install if you wire it in yourself. Add ~$300-500 for an electrician to wire the power center if you'd rather not.
- Is converting to saltwater worth it?
It depends on what you spend on chlorine now. A heavy spender ($800/yr) recoups the conversion in under two years; a medium spender ($500/yr) in about three; a light user spending $300/yr might wait seven years or never break even, because the salt cell wears out and needs replacing. Saltwater is cheaper chlorine, not free chlorine.
- How much salt do I need to convert?
For a 20,000-gallon pool to ~3,200 ppm: 534 lb of salt, which is about 14 forty-pound bags (~$120 at $9/bag). The calculator computes this exactly using the same salt-mass engine our pool salt calculator uses — pounds = ppm × gallons × 8.345 ÷ 1,000,000.
- Does a saltwater pool save money?
Yes, if you spend a lot on chlorine now — but it's not free. The salt generator cell is a consumable (~5-year life, ~$300-700 to replace) plus salt top-ups (~$30-60/yr), so ongoing cost is ~$100-200/yr. Your annual savings is your current chlorine bill minus that ~$150/yr, and the payback is the conversion total divided by the savings. Heavy chlorine users save a lot. Light users may not.
- Why isn't saltwater free to run?
Because the generator cell is a consumable part. The cell makes chlorine by electrolyzing salt, and the titanium electrodes wear out — typical life is about ten thousand operating hours, or ~3-5 years of seasonal use. Replacement runs $300-700 depending on the cell model. Amortized at ~$60-140/yr plus salt top-ups (~$30-60/yr), saltwater ongoing is ~$100-200/yr. Cheaper than chlorine for most users, but not zero.
- Can I convert it myself?
Yes — the cell plumbs into your existing return line and the power center connects to your timer wiring. The work most people hire out is wiring the power center to your electrical, which is where the ~$300-500 electrician fee comes in. The salt itself you broadcast around the pool perimeter with the pump running, brush it, and circulate for 24 hours before turning the generator on. None of it requires draining.
- What does it cost for a bigger pool?
More, mostly because the larger pool needs more salt and a bigger generator. A 15,000-gallon DIY conversion runs ~$730-950; a 30,000-gallon ~$1,200-1,560. The salt scales linearly with volume (more pool, more pounds); the generator steps up in classes (IC15 → IC20 → IC40 → IC60). Use the calculator with your volume for the exact figure.
- Are there reasons to convert besides money?
Yes — three common ones. People convert for the softer water feel (salt water is gentler on skin, hair, and eyes, without the chlorine smell). They convert to stop handling and storing jugs of liquid chlorine or buckets of tablets. And a salt system sanitizes more steadily, since it makes chlorine continuously instead of in big manual doses. If any of those matter to you, the conversion is worth it even when the dollars are a wash.
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