{"product_id":"hayward-sensor-orp-10-cable","title":"Hayward ORP Sensor with Cable, W3PRO25-10","description":"\u003cp\u003eThe Hayward W3PRO25-10 is the factory original ORP sensor for Hayward CAT controllers. It replaces the part previously sold as PRO25-10, and Hayward lists it as a 2 year sensor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat it measures\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eORP is oxidation reduction potential, and it is the reading a chemical controller uses to judge how hard the sanitizer in the water is working. The controller does not know what the chlorine level is; it knows what the probe tells it. When the probe drifts, every dosing decision downstream of it is made on bad information.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen to change it\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA sensor that will not hold a calibration, or that reads steadily against what a test kit shows, is worn out. Cleaning the tip is worth trying first, but a probe past its service life will not come back.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eOne thing to check before ordering\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe cable length appears two ways in the source data, as 10 inch in the product name and as a 10 foot cable in the product detail. If the distance from the controller to the sensor mount matters on your installation, confirm the length with us first.\u003c\/p\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":48628828864724,"sku":"HAY-451-1000","price":390.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_4749c1ef-e81b-4f15-a531-6f209ea303a1.jpg?v=1788753517","url":"https:\/\/www.activepoolsupply.com\/products\/hayward-sensor-orp-10-cable","provider":"Active Pool Supply","version":"1.0","type":"link"}