.product-description { color: inherit; line-height: 1.75; max-width: 860px; } .product-description h2 { font-size: 1.2rem; font-weight: 700; margin: 2rem 0 0.6rem; border-bottom: 2px solid #cce0ff; padding-bottom: 0.3rem; } .product-description h3 { font-size: 1rem; font-weight: 700; margin: 1.5rem 0 0.4rem; } .product-description p { margin: 0 0 1rem; } .product-description ul { margin: 0 0 1rem 1.4rem; padding: 0; } .product-description ul li { margin-bottom: 0.4rem; } .product-description .spec-list { margin: 1rem 0 1.5rem; font-size: 0.95rem; border: 1px solid #c4d9f0; border-radius: 4px; overflow: hidden; } .product-description .spec-row { display: flex; flex-wrap: wrap; border-bottom: 1px solid #c4d9f0; } .product-description .spec-row:last-child { border-bottom: none; } .product-description .spec-key { flex: 0 0 38%; background-color: #e8f1fb; font-weight: 700; padding: 0.5rem 0.75rem; box-sizing: border-box; } .product-description .spec-val { flex: 1 1 62%; padding: 0.5rem 0.75rem; box-sizing: border-box; } .product-description .spec-row:nth-child(even) .spec-val { background-color: #f5f9ff; } .product-description .spec-row:nth-child(even) .spec-key { background-color: #edf4fc; } @media (max-width: 540px) { .product-description .spec-key, .product-description .spec-val { flex: 0 0 100%; } .product-description .spec-key { padding-bottom: 0.2rem; } .product-description .spec-val { padding-top: 0.2rem; } } .product-description .doc-links { background-color: #f0f6ff; border-left: 4px solid #0066cc; padding: 0.75rem 1rem; margin: 1.5rem 0; border-radius: 0 4px 4px 0; } .product-description .doc-links h2 { border-bottom: none; margin: 0 0 0.4rem; font-size: 1rem; padding-bottom: 0; } .product-description .doc-links ul { margin: 0 0 0 1.2rem; } Hayward CAT Controller Gold ORP Sensor Probe, 24-inch cable (W3PRO25-AU-2). Gold sensing tip for enhanced millivolt stability in high-bather-load and indoor commercial pool applications. Direct replacement for all Hayward CAT and HCC series controllers. 1/2" NPT ABS body, BNC connector. 2-year warranty. SKU: W3PRO25-AU-2 2-year warranty Gold sensing tip: resists surface oxidation and fouling from combined chlorine better than standard platinum 24-inch cable for compact equipment rooms where controller and flow cell are in close proximity Compatible with CAT1000, CAT3500, CAT4000, CAT5000, CAT5500, HCC1000, HCC2000 Direct replacement for standard ORP probe; no controller reconfiguration required 1/2" NPT ABS injection-molded body; BNC connector Best for indoor pools, therapy pools, high-bather-load commercial facilities, and any installation with recurring combined chlorine challenges Do not extend or splice the cable; added impedance distorts the millivolt signal Verify against a calibrated portable ORP meter after installation Hayward CAT Controller Gold ORP Probe (W3PRO25-AU-2): Gold vs. Platinum for Commercial Pool Controls Gold electrodes resist the surface oxide formation and combined-chlorine fouling that can cause platinum probes to drift off the pool's true ORP value over time. In standard outdoor pools with well-balanced chemistry, platinum performs reliably. In indoor pools, therapy pools, and high-bather-load facilities where combined chlorine accumulates faster, the gold surface maintains reading accuracy longer and reduces calibration frequency. Drop-in replacement for the standard ORP probe; same flow cell port, same BNC connector, no software changes needed. 24-Inch Cable: Is It the Right Length? Measure the actual routed cable path from the flow cell ORP port to the controller's ORP input terminal before ordering. The 24-inch version suits installations where that distance is 18 to 22 inches with a few inches of service slack. If the run is longer, use the 10-foot cable version. Never splice or extend this cable. Hayward CAT Gold ORP Probe 24-Inch Specifications SKU W3PRO25-AU-2 Sensing Element Gold tip with integrated reference junction Measurement ORP (oxidation-reduction potential), millivolts Cable Length 24 inches (2 feet) Connector BNC (color-coded) Body 1/2" NPT injection-molded ABS Compatible Controllers CAT1000, CAT3500, CAT4000, CAT5000, CAT5500, HCC1000, HCC2000 Gold Advantage Reduced surface fouling in high-combined-chlorine, indoor, and variable-load environments Best-Fit Application Indoor pools, therapy pools, high-bather-load commercial facilities ORP Target (commercial) 650 mV or above per CDC Model Aquatic Health Code Replacement Interval Every 12 to 24 months Warranty 2-year Frequently Asked Questions Why choose gold over the standard platinum probe? Gold resists the surface oxide layer that forms on platinum in chlorinated water with elevated combined chlorine, which can cause the platinum probe to settle at a millivolt reading that no longer reflects true oxidizing capacity. In demanding environments, gold holds accuracy longer between service intervals. Is this a drop-in replacement for the platinum ORP probe? Yes. Same flow cell port threads, same BNC connector, no controller reconfiguration needed. Verify the reading against a portable ORP meter after installation as you would with any probe swap. Should I replace the pH probe at the same time? Replacing both probes in a single service visit is the most efficient approach and ensures the full measurement pair is renewed simultaneously. Hayward CAT Controller Gold ORP Probe 24-Inch Manual and Warranty Info Installation & Flow Cell Plumbing Guide (PDF) Millivolt Verification & Reference Meter Comparison Procedure (PDF) Gold vs. Platinum ORP Probe Selection Guide (PDF) { "@context": "https://schema.org/", "@type": "Product", "name": "Hayward CAT Controller Gold ORP Sensor Probe 24 Inch Cable", "brand": { "@type": "Brand", "name": "Hayward" }, "description": "Gold tip ORP replacement probe for Hayward CAT and HCC series pool chemical controllers. SKU W3PRO25-AU-2. 24-inch cable, BNC connector, 1/2\" NPT ABS body. Enhanced millivolt stability in high-combined-chlorine, indoor, and high-bather-load commercial pool environments. 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