People often treat spent swimming pool salt cells as worthless maintenance debris. A technician replaces a failed Hayward TurboCell, Pentair IntelliChlor, AutoPilot cell, or commercial chlorination cassette and often tosses the old unit into a scrap bin or discards it with other equipment waste. But a "dead" salt cell is not necessarily devoid of value. Many contain recoverable ruthenium and iridium, high-value platinum-group metals used in the catalytic coatings on their titanium electrodes.
Phoenix Refining buys spent residential salt chlorinator cells, commercial aquatic electrochlorination anodes, mixed metal oxide-coated titanium plates, and industrial chlorine-generator cassettes. Don't evaluate these materials solely as light titanium scrap.
Salt chlorination systems produce chlorine on site by passing electrical current through mildly saline water. At the core of the process are dimensionally stable anodes, often called DSA® or mixed metal oxide (MMO) electrodes. These electrode assemblies use commercially pure titanium, typically ASTM Grade 1 or Grade 2, as a strong, corrosion-resistant current distributor. Titanium is only part of the story. Each plate is coated with a thin, thermally sintered catalytic layer commonly made from ruthenium dioxide, iridium dioxide, titanium dioxide, and sometimes tantalum oxide. This coating drives the chlorine-evolution reaction, converting chloride ions in saltwater into chlorine.
Ruthenium dioxide provides strong chlorine-generation activity and helps the cell operate efficiently at lower voltage. Iridium dioxide improves durability under oxygen evolution, high current density, and repeated polarity reversals. Titanium dioxide and tantalum oxide act as stabilizers that protect the titanium substrate and maintain coating structure. Residential pool cells generally use precious-metal loading levels of about 5 to 15 grams per square meter of active surface area. Larger commercial, municipal, and industrial electrochlorination systems may use approximately 15 to 25 grams per square meter, often with higher iridium content for continuous-duty performance. While the coating is extremely thin, it has the highest recoverable value.
Salt cells usually don't fail because every particle of ruthenium and iridium has dissolved away. Many fail because the titanium substrate becomes electrically passivated beneath areas where the coating is damaged. Modern chlorinators routinely reverse polarity to help dissolve calcium carbonate scale, which can build up on the titanium substrate. This self-cleaning cycle helps, but repeated polarity changes can stress the MMO coating. Hydrogen evolution during cathodic operation can contribute to microscopic cracking and coating stress. Subsequent anodic operation can worsen those defects. Frequent muriatic acid washing may also erode the catalytic surface, especially when cells are cleaned too aggressively or too often.
As the coating develops pinholes or microcracks, saltwater can reach the titanium below. Under anodic electrical potential, exposed titanium rapidly forms titanium dioxide. Titanium dioxide is an excellent corrosion barrier, but it is also electrically resistive. As that insulating layer grows, the cell's internal resistance rises, and the controller must increase voltage to maintain chlorine output.
Eventually, the power supply detects abnormal operation and shuts the system down with warnings such as "Low Salt," "Inspect Cell," or "Check Cell." The cell is then replaced even though a substantial portion of its catalytic coating may remain on the plates. End-of-life cells may retain roughly 30% to 50% of their original precious-metal loading, depending on the model, operating history, maintenance practices, and coating condition. A representative 13-plate residential cell may contain more than one gram of combined ruthenium and iridium after removal from service. That is why an electrically failed cell can still be a valuable refining feedstock.
Most local scrap yards cannot recover the thin MMO coating from titanium plates. They see a small amount of titanium and price it by weight, often at ordinary low-grade titanium scrap rates. A typical residential electrode assembly may contain only about one pound of titanium, producing a payout of just a few dollars or less. This conventional scrap valuation misses the precious metals entirely. The ruthenium and iridium coating usually represents less than one percent of the assembly's total mass, making it difficult for standard scrap-sorting methods to identify or value. In fact, titanium remelters may consider MMO coatings undesirable because oxygen-bearing oxides and platinum-group metal particles can contaminate controlled titanium melt streams. As a result, some yards discount coated titanium heavily or decline to buy it.
A specialized precious-metal refiner takes the opposite approach. Rather than viewing the coating as contamination, the refiner treats it as the primary asset. Through controlled de-coating, chemical dissolution, separation, and assay procedures, the refiner can recover ruthenium and iridium while directing the titanium substrate to appropriate downstream recycling. The difference between the value of ordinary titanium scrap and the gross contained precious-metal value can be dramatic, depending on the cell type and the residual coating. Actual settlement depends on assay results, metal markets, recovery rates, lot size, and refining charges. Still, the fundamental point remains: don't value a spent salt cell only by its titanium weight.
Commercial aquatic facilities, including resorts, municipal pools, universities, water parks, fitness centers, and industrial treatment operations, often use larger on-site electrochlorination systems. Equipment such as De Nora ClorTec® and Evoqua OSEC® systems may contain multiple titanium anode cassettes, expanded mesh panels, or plate stacks operating continuously for years.
These commercial electrode banks can have active coated surface areas ranging from several square meters to dozens of square meters. When an installation replaces a full anode rack or skid bank, the outgoing equipment may contain a concentrated quantity of recoverable ruthenium and iridium. For facilities managers, the situation creates an opportunity to turn scheduled maintenance into an asset-recovery event. Instead of sending obsolete anodes into mixed scrap, commercial operators can consolidate the material for precious-metal refining and receive an assay-based settlement.
Spent chlorinator cells should be cleaned before shipment. Technicians should flush removed cells with fresh water to remove residual salt brine and hypochlorite. Cells that were recently acid-cleaned should be rinsed with an aqueous sodium bicarbonate solution to neutralize any residual muriatic acid. After rinsing, completely drain and dry the units before packing them in boxes, drums, or Gaylord containers. When clean and dry, chlorinator cells are generally inert metal articles suitable for standard freight handling. Materials legitimately sent for precious-metal reclamation may qualify for streamlined recycling management under applicable federal regulations, including 40 CFR 266.70. Businesses should maintain normal shipment records and avoid storing material indefinitely without a defined recycling plan.
Phoenix Refining provides a responsible recovery path for spent pool salt cells, commercial chlorine-generator anodes, MMO-coated titanium electrodes, and aquatic electrochlorination assemblies. Instead of accepting a few dollars in titanium scrap value or throwing the material away, pool companies, distributors, and facilities can recover value from the ruthenium and iridium still present in retired equipment. A salt cell may be finished making chlorine, but it may still be worth refining.
