Salt water pools now account for roughly 75% of new inground pool installations in the United States — and pool owners with older chlorine pools increasingly ask about converting. The appeal is real: softer water feel, less manual chemical handling, and lower long-term chlorine costs. But salt conversion isn't free or consequence-free. Here's the complete picture.
| System | Pool Size | System Price | Installed Cost |
|---|---|---|---|
| Hayward AquaRite (T-Cell-9) | Up to 25,000 gal | $550–$700 | $800–$1,200 |
| Hayward AquaRite (T-Cell-15) | Up to 40,000 gal | $650–$850 | $900–$1,350 |
| Pentair IntelliChlor IC40 | Up to 40,000 gal | $650–$800 | $900–$1,300 |
| Pentair IntelliChlor IC60 | Up to 60,000 gal | $800–$1,000 | $1,100–$1,600 |
| Jandy TruClear | Up to 42,000 gal | $700–$900 | $950–$1,400 |
Converting an existing freshwater pool to salt requires adding enough salt to reach the target salinity. Most salt chlorinators operate optimally at 2,700–3,400 PPM.
Salt quantity formula: Pool volume (gallons) × target PPM / 1,000,000 × 8.34 (lb/gal) = pounds of salt needed
For a 20,000-gallon pool starting from fresh water (0 PPM) targeting 3,200 PPM: 20,000 × 3,200 / 1,000,000 × 8.34 = approximately 534 lbs. Pool-grade salt runs $0.12–$0.20 per pound, making initial salt cost $65–$110 for a 20,000-gallon pool.
Salt is added in 40–50 lb bags. Many home centers and pool suppliers stock 40 lb bags of pool salt for $7–$12 each. Plan for 12–14 bags for a 20,000-gallon pool initial fill.
The most consistently reported benefit is water feel. Salt water at 3,200 PPM is not noticeably salty to taste (ocean water is 35,000 PPM), but it does feel softer and less irritating on skin, eyes, and hair than heavily chlorinated water. This benefit is real and consistent — it's not marketing.
Salt chlorinators automate the daily chlorination process. Once the system is configured, it generates chlorine continuously without manual dosing. For pool owners who travel or dislike the routine of adding chlorine, this convenience is significant.
Manual chlorine handling involves transporting, storing, and adding concentrated chemicals. Salt is benign by comparison — a non-hazardous, non-corrosive mineral that requires no special handling or storage precautions.
Electrolysis naturally raises pH. Salt pools tend to drift upward in pH, requiring more frequent acid addition to maintain 7.2–7.6. This is the most common ongoing chemistry challenge in salt pools and one that service professionals encounter constantly. Clients who don't understand why they're adding acid more often than before can become confused or resistant.
T-Cells and electrolytic cells last 3–5 years. Replacement costs $150–$380 depending on system and cell size. This is the primary ongoing expense of salt pool ownership that chlorine pools don't have. Factor $30–$80/year in amortized cell replacement cost into the total-cost-of-ownership comparison.
At 3,000 PPM, salt is significantly less corrosive than ocean water — but it is mildly corrosive over time to untreated stone coping, concrete deck surfaces, metal fixtures, and certain equipment components. Proper water balance (particularly pH and calcium hardness) minimizes this. Pools with extensive stone or concrete hardscaping near the waterline may see accelerated surface degradation versus a conventional chlorine pool.
When converting a client's pool to salt, document the conversion date, starting salt level, and initial chemistry readings in SplashLens. This gives you a reference point for monitoring pH drift patterns and helps you explain to the client why their acid demand has changed after conversion.
The answer depends on the client's priorities:
Log salt PPM, pH drift, acid additions, and T-Cell maintenance for every salt pool account in SplashLens. Free for pool service professionals — offline-first, no account required.
Open SplashLens Free →Salt water pool conversion costs $800–$2,500 for the salt chlorinator system plus $150–$400 in initial salt (approximately 200–400 lbs for a 20,000-gallon pool). Professional installation adds $200–$500. Total conversion cost runs $1,150–$3,400 depending on pool size and system chosen.
The physical installation of a salt chlorinator takes 2–4 hours for a professional. Adding salt and reaching target salinity (2,700–3,200 PPM) requires 24–48 hours of circulation before the chlorinator can be activated. Full conversion from chlorine-only to a functioning salt system takes 2–3 days.
Yes. Salt water pools produce chlorine through electrolysis — the water IS chlorinated. The difference is the source: a salt chlorinator generates chlorine on-site from salt rather than requiring purchased chlorine. Shock treatments with liquid chlorine are still occasionally needed for algae treatment or after heavy bather loads.
Salt water (at 3,000 PPM) is much lower salinity than ocean water (35,000 PPM) and is not significantly corrosive to properly maintained pool equipment. However, salt can accelerate corrosion on stone coping, concrete deck features, metal fixtures, and stainless steel components if water chemistry is imbalanced. Maintain proper pH and calcium hardness to minimize corrosive effects.
Salt water pool ongoing costs include: salt replacement ($30–$80/year for top-off due to water loss), T-Cell replacement every 3–5 years ($150–$380), electricity for the chlorinator (minor — $50–$100/year), and occasional supplemental chlorine or shock ($20–$50/year). Total ongoing cost is typically $250–$600/year vs $400–$900/year for manual chlorination.