{"id":571,"date":"2026-04-22T10:42:34","date_gmt":"2026-04-21T22:42:34","guid":{"rendered":"https:\/\/geckogullydemos.com\/mjr\/?post_type=mjr-faq&p=571"},"modified":"2026-05-27T18:26:24","modified_gmt":"2026-05-27T06:26:24","slug":"backflow-prevention","status":"publish","type":"mjr-faq","link":"https:\/\/geckogullydemos.com\/mjr\/mjr-faq\/backflow-prevention\/","title":{"rendered":"What is backflow prevention?"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"

Backflow prevention in Christchurch helps stop contaminated water from flowing back into the clean water supply during pressure changes.<\/p>\n","protected":false},"featured_media":227,"parent":0,"menu_order":0,"template":"","meta":[],"categories":[29],"tags":[98,198,99,183,21,199],"class_list":["post-571","mjr-faq","type-mjr-faq","status-publish","has-post-thumbnail","hentry","category-backflow-prevention-testing","tag-backflow-device-christchurch","tag-backflow-prevention","tag-backflow-testing-christchurch","tag-christchurch-plumbing-safety","tag-plumbing-maintenance-christchurch","tag-water-contamination-prevention-christchurch","has-post-title","has-post-date","has-post-category","has-post-tag","has-post-comment","has-post-author",""],"yoast_head":"\nWhat is backflow prevention? - MJ Robertson Plumbing and Gas<\/title>\n<meta name=\"description\" content=\"Backflow prevention in Christchurch helps stop contaminated water from flowing back into the clean water supply during pressure changes.\" \/>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is backflow prevention? 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- MJ Robertson Plumbing and Gas","description":"Backflow prevention in Christchurch helps stop contaminated water from flowing back into the clean water supply during pressure changes.","robots":{"index":"noindex","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"og_locale":"en_US","og_type":"article","og_title":"What is backflow prevention? - MJ Robertson Plumbing and Gas","og_description":"Backflow prevention in Christchurch helps stop contaminated water from flowing back into the clean water supply during pressure changes.","og_url":"https:\/\/geckogullydemos.com\/mjr\/mjr-faq\/backflow-prevention\/","og_site_name":"MJ Robertson Plumbing and Gas","article_modified_time":"2026-05-27T06:26:24+00:00","twitter_card":"summary_large_image","schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/geckogullydemos.com\/mjr\/mjr-faq\/backflow-prevention\/","url":"https:\/\/geckogullydemos.com\/mjr\/mjr-faq\/backflow-prevention\/","name":"What is backflow prevention? - MJ Robertson Plumbing and Gas","isPartOf":{"@id":"https:\/\/geckogullydemos.com\/mjr\/#website"},"primaryImageOfPage":{"@id":"https:\/\/geckogullydemos.com\/mjr\/mjr-faq\/backflow-prevention\/#primaryimage"},"image":{"@id":"https:\/\/geckogullydemos.com\/mjr\/mjr-faq\/backflow-prevention\/#primaryimage"},"thumbnailUrl":"https:\/\/geckogullydemos.com\/mjr\/wp-content\/uploads\/2026\/04\/MJ.png","datePublished":"2026-04-21T22:42:34+00:00","dateModified":"2026-05-27T06:26:24+00:00","description":"Backflow prevention in Christchurch helps stop contaminated water from flowing back into the clean water supply during pressure changes.","breadcrumb":{"@id":"https:\/\/geckogullydemos.com\/mjr\/mjr-faq\/backflow-prevention\/#breadcrumb"},"inLanguage":"en-NZ","potentialAction":[{"@type":"ReadAction","target":["https:\/\/geckogullydemos.com\/mjr\/mjr-faq\/backflow-prevention\/"]}]},{"@type":"ImageObject","inLanguage":"en-NZ","@id":"https:\/\/geckogullydemos.com\/mjr\/mjr-faq\/backflow-prevention\/#primaryimage","url":"https:\/\/geckogullydemos.com\/mjr\/wp-content\/uploads\/2026\/04\/MJ.png","contentUrl":"https:\/\/geckogullydemos.com\/mjr\/wp-content\/uploads\/2026\/04\/MJ.png","width":535,"height":487},{"@type":"BreadcrumbList","@id":"https:\/\/geckogullydemos.com\/mjr\/mjr-faq\/backflow-prevention\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/geckogullydemos.com\/mjr\/"},{"@type":"ListItem","position":2,"name":"MJR FAQs","item":"https:\/\/geckogullydemos.com\/mjr\/mjr-faq\/"},{"@type":"ListItem","position":3,"name":"What is backflow prevention?"}]},{"@type":"WebSite","@id":"https:\/\/geckogullydemos.com\/mjr\/#website","url":"https:\/\/geckogullydemos.com\/mjr\/","name":"MJ Robertson Plumbing and Gas","description":"Your Property Partner Across Christchurch - Day or Night Since 1955","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/geckogullydemos.com\/mjr\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-NZ"}]}},"ptb_metabox":{"ptb_mjr_service_text_1":"<p><strong>TL;DR:<\/strong> Backflow prevention in Christchurch is a way of stopping contaminated water from flowing back into the clean water supply. It protects drinking water by ensuring that water flows only in one direction.<\/p>\r\n<h2>What backflow means<\/h2>\r\n<p>Backflow happens when water flows in the opposite direction to normal.<\/p>\r\n<p>Instead of clean water entering your property, water from inside the system can flow backward into the main supply.<\/p>\r\n<p>This can occur if there is a change in pressure within the system.<\/p>\r\n<h2>Why backflow is a concern<\/h2>\r\n<p>If water flows backwards, it can carry contaminants with it.<\/p>\r\n<p>This may include:<\/p>\r\n<ul>\r\n<li>Chemicals<\/li>\r\n<li>Dirty water<\/li>\r\n<li>Other unwanted substances<\/li>\r\n<\/ul>\r\n<p>Backflow prevention helps stop these from entering the clean water supply.<\/p>\r\n<h2>How backflow prevention works<\/h2>\r\n<p>Backflow prevention devices are installed within the plumbing system.<\/p>\r\n<p>These devices are designed to allow water to flow in one direction only.<\/p>\r\n<p>If pressure changes and water tries to reverse, the device stops it.<\/p>\r\n<h2>Where backflow prevention is used<\/h2>\r\n<p>Backflow prevention is commonly used in:<\/p>\r\n<ul>\r\n<li>Commercial and industrial properties<\/li>\r\n<li>Properties with irrigation systems<\/li>\r\n<li>Sites where there is a higher risk of contamination<\/li>\r\n<\/ul>\r\n<p>In some cases, it may also be required in residential settings.<\/p>\r\n<h2>Why testing is important<\/h2>\r\n<p>Backflow devices need to be tested regularly to ensure they are working correctly.<\/p>\r\n<p>Testing confirms that the device will operate as intended during pressure changes.<\/p>","ptb_mjr_ask_mj":"<p><strong>It's there to make sure your clean water stays clean.<\/strong><\/p>\r\n<p>That is the purpose of backflow prevention.<\/p>","ptb_mjr_service_text_2":"<h2>How MJ Robertson approaches backflow prevention<\/h2>\r\n<p>MJ Robertson is a maintenance company specialising in plumbing across Christchurch.<\/p>\r\n<p>Backflow prevention is part of maintaining a safe and reliable water system.<\/p>\r\n<p>This may involve:<\/p>\r\n<ul>\r\n<li>Checking existing backflow devices<\/li>\r\n<li>Ensuring systems are set up correctly<\/li>\r\n<li>Carrying out testing where required<\/li>\r\n<\/ul>\r\n<p>The aim is to ensure water systems operate safely and as intended.<\/p>\r\n<h2>When backflow prevention may be required<\/h2>\r\n<p>Backflow prevention may be necessary if:<\/p>\r\n<ul>\r\n<li>Your property has systems that could contaminate water<\/li>\r\n<li>You are managing a commercial or managed facility<\/li>\r\n<li>Testing or compliance requirements apply<\/li>\r\n<\/ul>\r\n<p>Requirements can vary depending on the type of property.<\/p>\r\n<h2>Final thought<\/h2>\r\n<p>Backflow prevention in Christchurch plays an important role in protecting water quality.<\/p>\r\n<p>It ensures that clean water remains safe for use.<\/p>"},"ptb_taxonomy":{"category":[{"term_id":29,"name":"Backflow Prevention & Testing","slug":"backflow-prevention-testing","term_group":0,"term_taxonomy_id":29,"taxonomy":"category","description":"Backflow prevention in Christchurch. 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