{"product_id":"hayward-sensor-orp-24-cable","title":"Hayward Pro Series ORP Sensor with 24 in. Cable","description":"\u003cp\u003eThe Hayward W3PRO25-2 is the Pro Series 2 year ORP sensor with a 24 inch cable, built for Hayward CAT controllers. It is the factory original Hayward part and it replaces the earlier PRO25-2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat the sensor does\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eORP stands for oxidation reduction potential. It is not a measure of how much sanitizer is in the water but of how hard that sanitizer is working, which is the number a controller needs in order to decide when to feed. The probe sits in a flow cell in the sample line and reports continuously.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen to replace it\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eORP probes are consumable. The sensing surface ages, the response slows and the reading drifts, usually gradually enough that the controller keeps dosing to a number that no longer means what it did. If a probe will not hold calibration after cleaning, it is finished. This one is rated as a 2 year sensor.\u003c\/p\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":48628809859284,"sku":"HAY-451-1001","price":382.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_0ac47a97-ac57-4ddc-a7ea-9d2a9d43c924.jpg?v=1788752126","url":"https:\/\/www.activepoolsupply.com\/products\/hayward-sensor-orp-24-cable","provider":"Active Pool Supply","version":"1.0","type":"link"}