{"id":1652,"date":"2013-12-05T09:26:45","date_gmt":"2013-12-05T17:26:45","guid":{"rendered":"http:\/\/support.cleanwaterstore.com\/blog\/?p=1652"},"modified":"2026-07-23T14:01:18","modified_gmt":"2026-07-23T21:01:18","slug":"adding-filter-media-to-downflow-backwashing-neutralizers","status":"publish","type":"post","link":"https:\/\/www.cleanwaterstore.com\/blog\/adding-filter-media-to-downflow-backwashing-neutralizers\/","title":{"rendered":"Adding Filter Media to Downflow (Backwashing) Neutralizers"},"content":{"rendered":"<h1><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-14746 aligncenter\" src=\"https:\/\/www.cleanwaterstore.com\/blog\/wp-content\/uploads\/2013\/12\/cws_drinking_water-21.jpg\" alt=\"Smiling woman in a denim shirt holding a glass of water and giving a thumbs-up in a bright kitchen, surrounded by fresh vegetables on the counter.\" width=\"600\" height=\"400\" data-id=\"14746\" srcset=\"https:\/\/www.cleanwaterstore.com\/blog\/wp-content\/uploads\/2013\/12\/cws_drinking_water-21.jpg 600w, https:\/\/www.cleanwaterstore.com\/blog\/wp-content\/uploads\/2013\/12\/cws_drinking_water-21-300x200.jpg 300w, https:\/\/www.cleanwaterstore.com\/blog\/wp-content\/uploads\/2013\/12\/cws_drinking_water-21-400x267.jpg 400w, https:\/\/www.cleanwaterstore.com\/blog\/wp-content\/uploads\/2013\/12\/cws_drinking_water-21-500x333.jpg 500w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/h1>\n<p>Neutralizers and filtration media are essential components of a water treatment system, working together to provide cleaner water and improve overall water quality. Neutralizers, such as calcite and Corosex, are designed to raise the pH of acidic water, ensuring it falls within a neutral range. This process helps protect your plumbing and appliances from corrosion.<\/p>\n<p>On the other hand, filtration media, like activated carbon and zeolite, are used to remove impurities and contaminants from the water. These media work by trapping particles and absorbing unwanted substances, resulting in cleaner, safer water for your household. Understanding how these components work together is crucial for selecting the right filter media for your neutralizer, ensuring your water treatment system operates efficiently and effectively.<\/p>\n<h2>Choosing the Right Filter Media for Your Neutralizer<\/h2>\n<p>Choosing the right filter media for your neutralizer depends on several factors, including the type of contaminants present in the water, the desired filtration level, and the system&#8217;s flow rate. For instance, if you need to remove fluoride and arsenic from your water, you may want to consider using a filter media like activated alumina or KDF-85. These media are specifically designed to target and remove such contaminants.<\/p>\n<p>On the other hand, if your primary concern is removing iron and manganese, a filter media like Birm or Filox may be more suitable. It\u2019s also important to consider the cubic foot capacity of the filter media, as well as the correct gravel size and distribution, to ensure optimal performance. Properly sized gravel helps support the media and ensures even water flow through the system, enhancing filtration.<\/p>\n<h2>How to Add Calcite Filtration Media to Your Neutralizer Filter System (Step-by-Step)<\/h2>\n<p>Keeping your pH balanced is key if you&#8217;re using a well water treatment system. A common and effective method for raising low pH is using a neutralizer filter with calcite media. But once the calcite starts to dissolve over time, you&#8217;ll need to add more media to keep your system working properly.<\/p>\n<p>Earlier this week, a customer asked how to add more calcite media to his neutralizer. It&#8217;s a great question, and while the process is simple, it can vary depending on the type of neutralizer system you have, specifically, whether you have a top-fill plug or not.<\/p>\n<p>This guide will walk you through how to add calcite media to backwashing downflow neutralizer tanks\u00a0with and without a top fill plug.<\/p>\n<blockquote><p>Why Add Calcite Media to a Neutralizer Tank?<\/p><\/blockquote>\n<p>Calcite is a natural form of calcium carbonate used in neutralizer tanks to correct acidic water conditions. When acidic well water (pH below 7.0) passes through a tank filled with calcite, the media dissolves slowly and raises the pH to a neutral range of 7.0\u20138.0.<\/p>\n<p>Maintaining a proper pH:<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul style=\"list-style-type: circle;\">\n<li>Prevents corrosion of pipes and fixtures<\/li>\n<li>Protects your water heater and appliances<\/li>\n<li>Improves the water taste<\/li>\n<li>Reduces the risk of heavy metals leaching into your water<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Over time, the calcite dissolves and needs to be replenished, typically once or twice a year, depending on water usage and acidity.<\/p>\n<h2>Check the pH of Your Water<\/h2>\n<p>Before adding more calcite, test your water\u2019s pH before and after your neutralizer to ensure the removal of specific contaminants such as color, suspended matter, iron, hydrogen sulfide, and chloramines for optimal water quality. If your pH is consistently under 7.0, it\u2019s time to add media. A neutral pH is ideal (7.0\u20138.0), with\u00a0<span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\">an optimal target around\u00a0<strong>7.2 to 7.5<\/strong><\/span>.<\/p>\n<h2>How to Add Calcite to a Down-Flow Neutralizer <strong>With a Top Fill Plug<\/strong><\/h2>\n<h3>Materials Needed: Gravel<\/h3>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul style=\"list-style-type: circle;\">\n<li>Calcite media<\/li>\n<li>Hose or siphon<\/li>\n<li>Channel locks or pliers<\/li>\n<li>Optional: funnel, bucket, and towel<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>Steps:<\/h3>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\n<li><strong>Turn Off the Water or Bypass the System<\/strong><br \/>\nThis will depressurize the tank.<\/li>\n<li><strong>Start a Manual Backwash Cycle<\/strong><br \/>\nInitiating a cycle while bypassed relieves pressure from the control valve.<\/li>\n<li><strong>Unplug the Control Valve<\/strong><br \/>\nSafety first\u2014always unplug before opening the system.<\/li>\n<li><strong>Remove the Top Fill Plug<\/strong><br \/>\nUse channel locks or pliers.<\/li>\n<li><strong>Siphon 2\u20133 Gallons of Water<\/strong><br \/>\nThis prevents water from spilling when you add the media.<\/li>\n<li><strong>Add Calcite Media<\/strong><br \/>\nFill the tank 2\/3 full, leaving <strong>at least 12 inches<\/strong> of space for backwash expansion.<\/li>\n<li><strong>Replace the Plug &amp; Restore Power<\/strong><br \/>\nPlug the valve back in and carefully return the system to service.<\/li>\n<li><strong>Run 2 Backwash Cycles<\/strong><br \/>\nThis ensures the media is clean and properly settled.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<h2>How to Add Calcite to a Down-Flow Neutralizer <strong>Without a Top Fill Plug<\/strong><\/h2>\n<p>If your neutralizer doesn\u2019t have a fill plug, you\u2019ll need to remove the entire control valve to add media.<\/p>\n<p>Our extensive line of filtration products includes a variety of air and liquid filter media solutions tailored for different types of neutralizers, ensuring optimal performance in various applications.<\/p>\n<h3>Steps:<\/h3>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\n<li><strong>Turn Off or Bypass the System<\/strong><\/li>\n<li><strong>Start Manual Backwash Cycle &amp; Unplug Valve<\/strong><\/li>\n<li><strong>Remove the Control Valve<\/strong><br \/>\nCarefully unscrew and lift the valve off the tank.<\/li>\n<li><strong>Siphon Water From the Tank<\/strong><br \/>\nSiphon out a few gallons to prevent overflow.<\/li>\n<li><strong>Tape Off the Distributor Tube<\/strong><br \/>\nThis keeps calcite from falling into the internal tubing. Use a piece of electrical tape and leave a tail to remove it later.<\/li>\n<li><strong>Add Calcite Media<\/strong><br \/>\nFill the tank 2\/3 full, leaving 12\u2033 of space.<\/li>\n<li><strong>Remove Tape, Replace Valve, &amp; Restore System<\/strong><br \/>\nReconnect the control valve and turn the system back on.<\/li>\n<li><strong>Run 2 Full Backwash Cycles<\/strong><br \/>\nThis prepares the media for use.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<h2>Safety Precautions and Considerations<\/h2>\n<p>When working with neutralizers and filtration media, it\u2019s essential to take safety precautions to avoid mistakes and ensure correct installation. Always follow the manufacturer\u2019s instructions for handling and installing the filter media, and make sure to wear protective gear, such as gloves and safety glasses. Additionally, it\u2019s crucial to regularly maintain and replace the filter media to prevent contamination and ensure optimal performance.<\/p>\n<p>By taking the necessary safety precautions and considering the specific needs of your water treatment system, you can enjoy cleaner water and a longer filter life. Regular maintenance and adherence to safety guidelines will help you avoid common pitfalls and ensure your system continues to provide high-quality water for your home or business.<\/p>\n<p>Read more:<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"STjCe1Eudj\"><p><a href=\"https:\/\/www.cleanwaterstore.com\/blog\/should-i-use-an-upflow-neutralizer-or-a-backwashing-neutralizer\/\">What is a Calcite Neutralizer?<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;What is a Calcite Neutralizer?&#8221; &#8212; The Clean Well Water Report\" src=\"https:\/\/www.cleanwaterstore.com\/blog\/should-i-use-an-upflow-neutralizer-or-a-backwashing-neutralizer\/embed\/#?secret=SPGKEpHhgE#?secret=STjCe1Eudj\" data-secret=\"STjCe1Eudj\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<h2>How Often Should You Add Calcite Media?<\/h2>\n<p>Most homeowners add calcite once or twice a year, but this depends on your pH levels and water usage. If you notice your water returning to an acidic pH or see signs of corrosion, test the water and top off your media.<\/p>\n<h2>Can You Mix Calcite with Corosex?<\/h2>\n<p>Yes! Corosex (magnesium oxide) can be used with calcite to correct highly acidic water (pH 5.0\u20136.0). But use caution\u2014it dissolves faster and can overcorrect pH if not balanced properly. A common blend is 90% calcite to 10% Corosex.<\/p>\n<h2>Additional Maintenance Tips<\/h2>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul style=\"list-style-type: circle;\">\n<li>Avoid overfilling your tank.<\/li>\n<li>Check for leaks or clogs in the control valve.<\/li>\n<li>Always allow the system to complete at least two backwash cycles after adding media.<\/li>\n<li>Keep a record of when media is added and pH levels are tested.<\/li>\n<li>Utilized liquid filtration solutions tailored to food and beverage manufacturing to enhance cleanliness and operational efficiency and ensure strict hygiene and quality standards are met.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Discover how they help balance pH and protect plumbing. Visit <a href=\"https:\/\/www.usgs.gov\/\" target=\"_blank\" rel=\"noopener\">USGS.gov<\/a> to explore groundwater and water treatment basics.<\/p>\n<h2>Frequently Asked Questions (FAQs)<\/h2>\n<h3>1. How do I know if my neutralizer is working?<\/h3>\n<p>A: Check the pH before and after your filter. If the pH is above 7.0 after filtering, your system is working. You can also look for reduced corrosion or improved water taste.<\/p>\n<h3>2. Can I use calcite in an upflow neutralizer?<\/h3>\n<p>A: Yes, but the process for adding media is different. We&#8217;ll cover upflow instructions in a future post.<\/p>\n<h3>3. What size calcite should I use?<\/h3>\n<p>A: Most systems use medium-grade calcite, but always check your filter manual or consult a technician for your specific tank.<\/p>\n<h3>4. How long does a bag of calcite last?<\/h3>\n<p>A: On average, a 50 lb.. bag can last 6\u201312 months in a standard home, depending on pH and water use.<\/p>\n<h3>5. What&#8217;s the best time of year to add calcite?<\/h3>\n<p>A: Late fall or early spring is common, but the best time is when your pH levels drop below 7.0.<\/p>\n<h3>6. Should I hire a professional or DIY?<\/h3>\n<p>A: If you&#8217;re comfortable with basic plumbing and following instructions, adding calcite is a safe DIY task. If unsure, call a technician.<\/p>\n<h3>7. Will adding calcite increase water hardness?<\/h3>\n<p>A: Yes, slightly. You may notice minor calcium buildup, but it&#8217;s generally not a concern unless you already have hard water.<\/p>\n<p><a href=\"https:\/\/cleanwater.leadpages.co\/serve-leadbox\/9GpUewPQtYQRv8i8QwCKLW\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" style=\"cursor: pointer;\" src=\"https:\/\/lh3.googleusercontent.com\/B72m7b7oSwbQbHSr56VeP7W9dw8HuPm5OwJTu_5vqqe-HyMPeJgufPmv7BZ4rrAP4vu40KTh_FyH_Q-H_kAv9_mVi-olev0us4m2=s0\" alt=\"Treating Acid Well Water (FREE)\" width=\"654\" height=\"287\" data-leadbox-popup=\"9GpUewPQtYQRv8i8QwCKLW\" data-leadbox-domain=\"cleanwater.lpages.co\" \/><\/a><\/p>\n<p><a href=\"https:\/\/go.appointmentcore.com\/book\/eZeZdVQj\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-13629 size-full\" src=\"https:\/\/www.cleanwaterstore.com\/blog\/wp-content\/uploads\/2025\/05\/call-request-cta.jpg\" alt=\"Blue banner with a phone icon and text: \u201cRequest a Free Call \u2013 1-888-600-5426. Would you like more information about our water treatment systems? Or schedule a free call: Book Now.\" width=\"1024\" height=\"160\" data-id=\"13629\" srcset=\"https:\/\/www.cleanwaterstore.com\/blog\/wp-content\/uploads\/2025\/05\/call-request-cta.jpg 1024w, https:\/\/www.cleanwaterstore.com\/blog\/wp-content\/uploads\/2025\/05\/call-request-cta-300x47.jpg 300w, https:\/\/www.cleanwaterstore.com\/blog\/wp-content\/uploads\/2025\/05\/call-request-cta-768x120.jpg 768w, https:\/\/www.cleanwaterstore.com\/blog\/wp-content\/uploads\/2025\/05\/call-request-cta-400x63.jpg 400w, https:\/\/www.cleanwaterstore.com\/blog\/wp-content\/uploads\/2025\/05\/call-request-cta-500x78.jpg 500w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Neutralizers and filtration media are essential components of a water treatment system, working together to provide cleaner water and improve overall water quality. Neutralizers, such as calcite and Corosex, are designed to raise the pH of acidic water, ensuring it falls within a neutral range. This process helps protect your plumbing and appliances from corrosion. &hellip; <a href=\"https:\/\/www.cleanwaterstore.com\/blog\/adding-filter-media-to-downflow-backwashing-neutralizers\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Adding Filter Media to Downflow (Backwashing) Neutralizers<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":14746,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[25,38,53,1,50,27,4],"tags":[336,37],"class_list":["post-1652","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-acid-water","category-calcite-neutralizer","category-filter-media","category-uncategorized","category-tutorial","category-water-purification","category-well-water-treatment","tag-calcite-acid-neutralizer","tag-calcite-neutralizers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.6 (Yoast SEO v28.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Adding Filter Media to Downflow (Backwashing) Neutralizers<\/title>\n<meta name=\"description\" content=\"Learn how downflow backwashing neutralizer filters work for water purification. 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