{"product_id":"hayward-cat-4000-commercial-water-chemistry-controller","title":"Hayward CAT 4000 Commercial Water Chemistry Controller","description":"\u003c!-- more --\u003e\n\u003cstyle\u003e\n  .product-description {\n    color: inherit;\n    line-height: 1.75;\n    max-width: 860px;\n  }\n  .product-description h2 {\n    font-size: 1.2rem;\n    font-weight: 700;\n    margin: 2rem 0 0.6rem;\n    border-bottom: 2px solid #cce0ff;\n    padding-bottom: 0.3rem;\n  }\n  .product-description h3 {\n    font-size: 1rem;\n    font-weight: 700;\n    margin: 1.5rem 0 0.4rem;\n  }\n  .product-description p { margin: 0 0 1rem; }\n  .product-description ul { margin: 0 0 1rem 1.4rem; padding: 0; }\n  .product-description ul li { margin-bottom: 0.4rem; }\n  .product-description .spec-list {\n    margin: 1rem 0 1.5rem;\n    font-size: 0.95rem;\n    border: 1px solid #c4d9f0;\n    border-radius: 4px;\n    overflow: hidden;\n  }\n  .product-description .spec-row {\n    display: flex;\n    flex-wrap: wrap;\n    border-bottom: 1px solid #c4d9f0;\n  }\n  .product-description .spec-row:last-child { border-bottom: none; }\n  .product-description .spec-key {\n    flex: 0 0 38%;\n    background-color: #e8f1fb;\n    font-weight: 700;\n    padding: 0.5rem 0.75rem;\n    box-sizing: border-box;\n  }\n  .product-description .spec-val {\n    flex: 1 1 62%;\n    padding: 0.5rem 0.75rem;\n    box-sizing: border-box;\n  }\n  .product-description .spec-row:nth-child(even) .spec-val { background-color: #f5f9ff; }\n  .product-description .spec-row:nth-child(even) .spec-key { background-color: #edf4fc; }\n  @media (max-width: 540px) {\n    .product-description .spec-key,\n    .product-description .spec-val { flex: 0 0 100%; }\n    .product-description .spec-key { padding-bottom: 0.2rem; }\n    .product-description .spec-val { padding-top: 0.2rem; }\n  }\n  .product-description .doc-links {\n    background-color: #f0f6ff;\n    border-left: 4px solid #0066cc;\n    padding: 0.75rem 1rem;\n    margin: 1.5rem 0;\n    border-radius: 0 4px 4px 0;\n  }\n  .product-description .doc-links h2 {\n    border-bottom: none;\n    margin: 0 0 0.4rem;\n    font-size: 1rem;\n    padding-bottom: 0;\n  }\n  .product-description .doc-links ul { margin: 0 0 0 1.2rem; }\n  .product-description .note {\n    background-color: #edf5fc;\n    border-left: 4px solid #0066cc;\n    padding: 0.75rem 1rem;\n    font-size: 0.93rem;\n    margin: 1rem 0;\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"product-description\" itemscope itemtype=\"https:\/\/schema.org\/Product\"\u003e\n  \u003cmeta itemprop=\"name\" content=\"Hayward CAT 4000 Commercial Water Chemistry Controller with Wi-Fi\"\u003e\n  \u003cmeta itemprop=\"brand\" content=\"Hayward\"\u003e\n  \u003cmeta itemprop=\"sku\" content=\"W3CAT4000WIFI\"\u003e\n  \u003cmeta itemprop=\"category\" content=\"Pool Controls\"\u003e\n\n  \u003cp itemprop=\"description\"\u003eHayward CAT 4000 (W3CAT4000WIFI) is an NSF\/ANSI 50 certified commercial water chemistry controller with Wi-Fi. Continuously monitors and controls ORP and pH for automated sanitizer and acid dosing. Wireless remote monitoring via PoolComm for 24\/7 access from any device. Includes pH and ORP sensors, flow cell, flow switch, PVC backboard, back-up sanitizer relay, and one aux relay. 5-year warranty on controller; 2-year on sensors.\u003c\/p\u003e\n\n  \u003cul\u003e\n    \u003cli\u003eSKU: W3CAT4000WIFI\u003c\/li\u003e\n    \u003cli\u003e5-year limited warranty on controller; 2-year limited warranty on sensors\u003c\/li\u003e\n    \u003cli\u003eNSF\/ANSI Standard 50 certified\u003c\/li\u003e\n    \u003cli\u003eContinuous ORP and pH monitoring with automatic chemical feed control\u003c\/li\u003e\n    \u003cli\u003eWi-Fi connected; links to PoolComm for remote monitoring, alarm notifications (email, SMS, visual, audible), and data logging from any web device\u003c\/li\u003e\n    \u003cli\u003ePoolComm is a subscription service; monthly charges apply\u003c\/li\u003e\n    \u003cli\u003eView water quality data, print charts, analyze graphs, and change controller settings remotely\u003c\/li\u003e\n    \u003cli\u003eDual sanitizer setpoints for back-up ORP control\u003c\/li\u003e\n    \u003cli\u003eOne auxiliary relay for additional control versatility\u003c\/li\u003e\n    \u003cli\u003eCompatible with all types of chemical feed equipment\u003c\/li\u003e\n    \u003cli\u003eIncludes: pH sensor, ORP sensor, machined flow cell and rotary flow sensor, flow switch, PVC backboard\u003c\/li\u003e\n    \u003cli\u003eFlow switch interlock suspends dosing when circulation stops\u003c\/li\u003e\n    \u003cli\u003eNEMA 4X enclosure for equipment room and mechanical space installation\u003c\/li\u003e\n    \u003cli\u003eOne controller per pool or independent circulation system\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eHayward CAT 4000 Commercial Water Chemistry Controller (W3CAT4000WIFI): Automated ORP and pH Management\u003c\/h2\u003e\n  \u003cp\u003eThe CAT 4000 continuously samples ORP and pH from flow-cell sensors in the pool circulation stream and activates chemical feed pumps automatically to hold both parameters within programmed setpoints. No hourly manual testing required. Wi-Fi connects the controller to PoolComm so facility managers can monitor water chemistry, receive alarms, and adjust settings remotely from any internet-connected device around the clock. The professional package includes all sensors, flow cell, flow switch, and backboard for complete out-of-box installation.\u003c\/p\u003e\n\n  \u003ch2\u003eWhy the CAT 4000 Controls to ORP, Not Calculated Free Chlorine\u003c\/h2\u003e\n  \u003cp\u003eORP measures the water's actual electrochemical oxidizing capacity, not a theoretical chlorine demand calculation. At the same free chlorine concentration, ORP varies significantly with pH, combined chlorine levels, temperature, and stabilizer. Controlling to ORP gives the CAT 4000 a direct, real-time relationship with actual sanitation effectiveness, which is why ORP-based control is the commercial aquatic industry standard. pH control runs in parallel for coordinated acid dosing.\u003c\/p\u003e\n\n  \u003ch2\u003eHayward CAT 4000 Water Chemistry Controller Specifications\u003c\/h2\u003e\n  \u003cdiv class=\"spec-list\"\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eSKU\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eW3CAT4000WIFI\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eCertification\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eNSF\/ANSI Standard 50 Listed\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eControl Parameters\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eORP (mV) and pH\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eORP Range\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003e0 to 1000 mV\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003epH Range\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003e0 to 14\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eConnectivity\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eBuilt-in Wi-Fi; remote access via PoolComm (subscription required)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eAlarm Formats\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eEmail, SMS, visual, audible\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eRelay Outputs\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eORP chemical feed, pH chemical feed, back-up sanitizer, (1) auxiliary relay\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eSafety Interlock\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eFlow switch input; suspends dosing when flow stops\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eDisplay\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eBacklit LCD; real-time ORP, pH, and status\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eData Logging\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eYes; exportable for regulatory compliance documentation\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eEnclosure\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eNEMA 4X (watertight, corrosion-resistant)\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003ePower\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003e120V \/ 240V dual voltage\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eIncludes\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003epH and ORP sensors, machined flow cell, rotary flow sensor, flow switch, PVC backboard\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eApplication\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eCommercial pools, aquatic centers, water parks, splash pads; one unit per pool\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eWarranty\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003e5-year limited (controller); 2-year limited (sensors)\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"note\"\u003eORP and pH setpoints must meet or exceed the minimums specified by your applicable state or local health code. Setpoint programming should be completed in collaboration with a certified pool operator (CPO) or aquatic facility consultant. The CAT 4000 is a control and monitoring tool, not a substitute for qualified operator oversight.\u003c\/div\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n  \u003ch3\u003eHow many pools can one CAT 4000 manage?\u003c\/h3\u003e\n  \u003cp\u003eOne. Each CAT 4000 manages one pool or one independent circulation system. Multi-pool facilities require one unit per pool. All units at a facility can be monitored from the same PoolComm dashboard, but each operates independently.\u003c\/p\u003e\n\n  \u003ch3\u003eIs PoolComm remote monitoring included or a separate subscription?\u003c\/h3\u003e\n  \u003cp\u003ePoolComm is a subscription-based service with monthly charges. The controller includes the Wi-Fi hardware to connect to it, but the monitoring service itself is billed separately.\u003c\/p\u003e\n\n  \u003ch3\u003eIs the CAT 4000 compatible with salt chlorination systems?\u003c\/h3\u003e\n  \u003cp\u003eYes. The CAT 4000 can work with salt chlorination as the oxidizer source. The ORP sensor monitors sanitizer output, and the controller can modulate the cell or trigger supplemental dosing. Confirm integration compatibility with the specific salt system being used before installation, as integration methods vary by manufacturer.\u003c\/p\u003e\n\n  \u003ch3\u003eWhat ORP setpoint should be programmed?\u003c\/h3\u003e\n  \u003cp\u003eThe setpoint must meet or exceed your jurisdiction's regulatory minimum, commonly 650 mV for stabilized pools or 720 mV or higher for unstabilized pools. Because ORP drops as pH rises and combined chlorine builds, program a safety margin above the regulatory minimum. Consult a CPO or aquatic facility consultant for your specific facility conditions.\u003c\/p\u003e\n\n  \u003cdiv class=\"doc-links\" role=\"complementary\" aria-label=\"Hayward CAT 4000 Water Chemistry Controller Manual and Warranty Info\"\u003e\n    \u003ch2\u003eHayward CAT 4000 Water Chemistry Controller Manual and Warranty Info\u003c\/h2\u003e\n    \u003cul\u003e\n      \u003cli\u003e\u003ca href=\"\/files\/hayward-cat-4000-water-chemistry-controller-owners-manual.pdf\" target=\"_blank\" rel=\"noopener\"\u003eOwner's Manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n      \u003cli\u003e\u003ca href=\"\/files\/hayward-cat-4000-water-chemistry-controller-installation-guide.pdf\" target=\"_blank\" rel=\"noopener\"\u003eInstallation and Setup Guide (PDF)\u003c\/a\u003e\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cscript type=\"application\/ld+json\"\u003e\n  {\n    \"@context\": \"https:\/\/schema.org\/\",\n    \"@type\": \"Product\",\n    \"name\": \"Hayward CAT 4000 Commercial Water Chemistry Controller with Wi-Fi\",\n    \"brand\": { \"@type\": \"Brand\", \"name\": \"Hayward\" },\n    \"sku\": \"W3CAT4000WIFI\",\n    \"description\": \"NSF\/ANSI 50 certified commercial water chemistry controller. Continuous ORP and pH monitoring with automated chemical feed control. Wi-Fi connected via PoolComm for remote monitoring, alarm notifications, and data logging. 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