They both use chlorine - that is the surprise
The biggest misconception about salt water pools is that they do not use chlorine. They do. A salt water pool uses a salt cell (an electrolytic generator) to convert dissolved salt into chlorine continuously, replacing the need for manual chlorine addition. The water in a salt water pool contains approximately 3,000 parts per million salt - about 1/10 the salinity of seawater, similar to a contact lens solution. The chlorine produced by the salt cell is identical to the chlorine added manually to a traditional pool. The difference is the delivery mechanism, not the sanitizer chemistry.
The salt cell is the key piece of equipment
The salt cell is a flow-through cartridge installed in the pool's circulation plumbing. Pentair, Hayward, and Jandy all manufacture salt cells; current models are typically rated for 20,000 to 60,000 gallon pools and have an operating life of 5 to 7 years. Salt cells run $800 to $1,500 for the cell itself plus controller, plus installation. Replacement at the 5- to 7-year mark is the largest single maintenance cost difference between salt water and traditional chlorine pools.
Daily and weekly maintenance: salt is significantly easier
Salt water pool owners typically spend 5 to 10 minutes per week on water chemistry - adding salt occasionally as it depletes from splash-out and backwash, monitoring the salt cell output, and adjusting pH which tends to drift high in salt water systems. Traditional chlorine pool owners typically spend 15 to 30 minutes per week on chemistry - testing chlorine levels, adding tablets to floaters or feeders, monitoring pH and alkalinity, dosing shock weekly. Over a 20-week swim season, salt saves 10 to 20 hours of maintenance time.
Cost comparison over 10 years
A salt cell installation adds $2,500 to $4,000 to the initial pool construction cost. Salt costs $200 to $400 per year. Salt cell replacement at year 5 to 7 runs $1,000 to $1,500. Total 10-year cost: approximately $4,500 to $7,000 above traditional chlorine. Traditional chlorine maintenance costs $600 to $1,000 per year for tablets, shock, and stabilizer - $6,000 to $10,000 over 10 years. Net cost difference over 10 years: salt is roughly $1,000 to $3,000 less expensive total. The cost difference narrows significantly if salt cell replacements run higher than expected (some installations go through cells faster).
Finish wear: salt is harder on certain materials
Salt water is more aggressive than chlorinated freshwater on certain pool materials. Natural stone coping (bluestone, travertine, limestone) shows efflorescence - white salt deposits - more readily on salt pools and requires more frequent cleaning and resealing. Plaster finishes can show etching after extended salt exposure, particularly if water chemistry drifts. Glass tile, properly-installed Pebble Tec, and quartz-aggregate finishes hold up well to salt. Metal hardware (handrails, ladders, light niches) requires marine-grade selection - 316 stainless steel or anodized aluminum, not standard 304 stainless. Connecticut winter freeze cycles compound salt wear on natural stone coping; many CT salt pool owners switch to porcelain or sealed concrete coping for this reason.
Winterization in Connecticut
Connecticut salt water pools must be winterized identically to chlorine pools: water level lowered below the skimmer mouth, plumbing blown out and antifreezed, salt cell removed and stored indoors over winter. Salt does not affect winterization complexity, but the salt cell removal step is one extra item compared to chlorine pools. Storing the salt cell indoors at moderate temperatures extends its operational life.
The swimmer experience
Salt water pool water feels softer and silkier than chlorinated freshwater because the lower free-chlorine residual and the salt itself reduce the chemical "bite" that swimmers describe. Eyes and mucous membranes are less irritated. Hair and skin dry less. The taste of accidentally-swallowed water is mildly salty rather than chlorine-sharp. For families with sensitive skin or who swim frequently, the experiential difference is meaningful.
Recommendation for most CT/NY luxury pool clients
For most luxury pool clients in Connecticut and Westchester County, we recommend salt water with porcelain or sealed-concrete coping, marine-grade hardware, and a high-quality salt cell from Pentair or Jandy. The maintenance reduction is meaningful, the swimmer experience is better, and the long-term cost is comparable to chlorine. The exceptions: clients committed to natural stone coping should plan for more frequent coping resealing on salt; clients who plan to drain and refill frequently (which depletes salt and requires re-dosing) may find chlorine simpler.