{"product_id":"crystal-quest-nitrate-under-sink-filtration-system","title":"Crystal Quest Nitrate Under Sink Filtration System","description":"\u003ch2\u003eCrystal Quest Nitrate Under Sink Water Filtration System – Drinking Water Filter\u003c\/h2\u003e\n\u003cp\u003eThe Crystal Quest Nitrate Under Sink Water Filter System is a point-of-use drinking water filter designed to install beneath a sink and connect to the included faucet and installation hardware. It is available in single, double, and triple configurations, with the installation valve selected based on the home’s under-sink plumbing. The system uses a nitrate-selective cartridge designed to reduce nitrates from drinking water, with SMART and carbon block filtration stages included depending on the selected configuration. The nitrate cartridge is listed for 90% to 95% nitrate reduction, with performance depending on influent water conditions, water usage, and regeneration. With a 1\/4\" connection size, this under-sink nitrate water filter is intended for point-of-use drinking water applications in homes, apartments, offices, and similar settings where nitrate reduction is a treatment goal.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eUnder-Sink Nitrate Reduction for Drinking Water\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis Crystal Quest system installs beneath the sink to keep the filter housing off the countertop. It is designed for point-of-use drinking water applications where water testing has identified nitrate as a treatment concern and the included faucet setup is preferred.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eNitrate-Selective Cartridge with Regenerable Media\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe nitrate removal cartridge uses nitrate-selective media and is listed for 90% to 95% nitrate reduction, with performance dependent on influent water conditions. The cartridge requires manual salinity regeneration using sodium chloride brine, with regeneration timing based on influent nitrate level, water usage, and cartridge performance.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSingle, Double, or Triple Configurations\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe nitrate cartridge is the core filtration stage. The single configuration includes the nitrate cartridge, the double configuration adds the SMART cartridge, and the triple configuration adds both SMART and carbon block filtration.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eConnection Type and Installation Planning\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eSelect the installation valve based on the home’s under-sink plumbing and the installation manual. Crystal Quest states that a saddle valve is used for hard copper tubing, while a T-valve is required for flex tubing. A leak detector or flood-prevention valve may be considered as a recommended add-on for added installation protection where appropriate.\u003c\/p\u003e\n\u003c!-- Responsive Image\/Text Blocks --\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; justify-content: center; padding: 0;\"\u003e\n\u003cdiv style=\"flex: 1 1 300px; max-width: 50%; padding: 0 4px;\" class=\"responsive-half\"\u003e\u003cimg decoding=\"async\" loading=\"lazy\" style=\"width: 100%; height: auto;\" class=\"responsive-image\" alt=\"Crystal Quest nitrate under sink water filter system for drinking water filtration\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0761\/5781\/2888\/files\/single-nitrate-under-sink-water-filter-system-crystal-quest-under-sink-water-filters-33135897575517.webp?v=1777594434\" width=\"1000\" height=\"1000\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 300px; max-width: 50%; padding: 1rem; text-align: center;\" class=\"responsive-half\"\u003e\n\u003cp\u003eThis under-sink nitrate water filter is designed for kitchens and point-of-use drinking water setups where under-sink placement is preferred. It connects below the sink and supplies filtered water through the included faucet setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Image Block 2 --\u003e\n\u003cdiv class=\"image-block-2\" style=\"display: flex; flex-wrap: wrap; align-items: center; justify-content: center; padding: 0;\"\u003e\n\u003cdiv style=\"flex: 1 1 300px; max-width: 50%; padding: 1rem; text-align: center;\" class=\"responsive-half\"\u003e\n\u003cp\u003eChoose the configuration and valve option that match your available installation space, plumbing, and water test results. Single, double, and triple layouts support different cartridge combinations, while saddle-valve and T-valve selections support different under-sink plumbing setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 300px; max-width: 50%; padding: 0 4px;\" class=\"responsive-half\"\u003e\u003cimg decoding=\"async\" loading=\"lazy\" style=\"width: 100%; height: auto;\" class=\"responsive-image\" alt=\"Crystal Quest nitrate under sink filter single double triple configurations and valve options\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0761\/5781\/2888\/files\/triple-nitrate-under-sink-water-filter-system-crystal-quest-under-sink-water-filters-33135897509981.webp?v=1777594435\" width=\"1000\" height=\"1000\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Mobile Stack Fix --\u003e\n\u003cstyle\u003e\n@media(max-width:768px) {\n  .responsive-half { max-width: 100% !important; flex: 1 1 100% !important; }\n  .responsive-image { width: 100% !important; height: auto !important; }\n  .image-block-2 { flex-direction: column-reverse !important; }\n}\n\u003c\/style\u003e\n\u003ch3\u003eCrystal Quest Nitrate Under Sink Water Filtration System Features \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNitrate-selective cartridge:\u003c\/strong\u003e Uses media designed specifically for reducing nitrates from drinking water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eListed nitrate reduction:\u003c\/strong\u003e Nitrate reduction is listed at 90% to 95%, with performance dependent on influent water conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRegenerable media:\u003c\/strong\u003e The nitrate cartridge requires manual salinity regeneration using sodium chloride brine, with timing based on influent nitrate level, water usage, and cartridge performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnder-sink installation:\u003c\/strong\u003e Installs beneath the sink to keep the filtration system out of countertop space.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded faucet hardware:\u003c\/strong\u003e Comes with a faucet and necessary installation hardware for filtered water access; installation valve selection depends on under-sink plumbing type.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation valve guidance:\u003c\/strong\u003e Crystal Quest states that a saddle valve is used for hard copper tubing, while a T-valve is required for flex tubing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeak detector option:\u003c\/strong\u003e A flood-prevention valve may be considered for added installation protection where appropriate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"background: #EFE9DC; color: #1f1f1f; border: 1px solid #D6D0C4; border-radius: 8px; padding: 1.5rem; text-align: center; margin: 2rem 0;\"\u003e\n\u003cp\u003e\u003cstrong\u003eNeed help choosing the right nitrate under-sink filter?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTrueStead Supply can help you compare configuration size, connection type, and nitrate filtration needs.\u003c\/p\u003e\n\u003cp\u003e✓ Nitrate-selective cartridge\u003cbr\u003e✓ Manual sodium chloride brine regeneration\u003cbr\u003e✓ Plumbing-based installation valve selection\u003c\/p\u003e\n\u003ca href=\"https:\/\/www.truesteadsupply.com\/pages\/contact-us\" style=\"display: inline-block; padding: 0.75rem 1.5rem; background-color: #2f4f2f; color: #ffffff; text-decoration: none; font-weight: bold; border-radius: 6px;\"\u003eContact Us for a Quote\u003c\/a\u003e\n\u003c\/div\u003e\n\u003ch3\u003eCrystal Quest Nitrate Under Sink Water Filtration System Specifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin-bottom: 2rem; border: 1px solid #D6D0C4;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eCrystal Quest\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eProduct Type\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eNitrate under sink water filtration system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eInstallation Type\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eUnder sink, included faucet setup\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eConfiguration Options\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eSingle, double, or triple\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eCartridge Mapping\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eSingle: nitrate cartridge; Double: nitrate + SMART; Triple: nitrate + SMART + carbon block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eInstallation Valve Guidance\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eSaddle valve for hard copper tubing; T-valve for flex tubing, per Crystal Quest guidance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eConnection Size\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e1\/4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003ePrimary Cartridge Type\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eNitrate-selective media cartridge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eNitrate Reduction\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e90% to 95%, based on listed source conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eNitrate Cartridge Capacity\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eCapacity varies by influent nitrate level and source-water conditions; system-specific source material lists 3,000 ppm of nitrates as CaCO3, while cartridge-only source material lists 5,500 ppm.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eReplacement Cartridge SKU\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eCQE-RC-04007\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eReplacement Cartridge Size\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e2-7\/8\" × 9-3\/4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eRegeneration Requirement\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eManual salinity regeneration using sodium chloride brine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eWater Testing Note\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eNitrate reduction performance, regeneration timing, and cartridge service life depend on influent nitrate level, water usage, and source-water conditions; water testing is recommended before sizing or replacement planning.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eRegeneration Timing\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eVaries based on influent nitrate level, water usage, and cartridge performance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eAdditional Cartridge Stages\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eDouble configurations add SMART filtration; triple configurations add SMART and carbon block filtration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eMax Flow Rate\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e0.5 GPM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eOperating Pressure\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e20-60 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e40°F-90°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eSingle Dimensions\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e5\" L × 14\" H × 5\" W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eDouble Dimensions\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e10\" L × 14\" H × 5\" W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eTriple Dimensions\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e15\" L × 14\" H × 5\" W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eRecommended Add-On\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eLeak detector \/ flood-prevention valve may be considered where appropriate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eInstallation Note\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eFollow the installation manual for faucet, valve, connection, and pressure-related setup requirements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eCrystal Quest Nitrate Under Sink Water Filtration System Info\u003c\/h4\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" title=\"UndersinkWaterFilterManual.pdf\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0761\/5781\/2888\/files\/Undersink-SingleDoubleTripleManual23.pdf?v=1777514362\" target=\"_blank\"\u003eUndersink Manual\u003c\/a\u003e\u003c\/p\u003e","brand":"Crystal Quest","offers":[{"title":"Single \/ T-Valve","offer_id":48949591081112,"sku":"CQE-US-00324-T","price":160.9,"currency_code":"USD","in_stock":true},{"title":"Single \/ Saddle Valve","offer_id":48949591113880,"sku":"CQE-US-00324-S","price":160.9,"currency_code":"USD","in_stock":true},{"title":"Single \/ Both","offer_id":48949591146648,"sku":"CQE-US-00324-B","price":169.85,"currency_code":"USD","in_stock":true},{"title":"Double \/ T-Valve","offer_id":48949591179416,"sku":"CQE-US-00322-T","price":201.35,"currency_code":"USD","in_stock":true},{"title":"Double \/ Saddle Valve","offer_id":48949591212184,"sku":"CQE-US-00322-S","price":201.35,"currency_code":"USD","in_stock":true},{"title":"Double \/ Both","offer_id":48949591244952,"sku":"CQE-US-00322-B","price":242.25,"currency_code":"USD","in_stock":true},{"title":"Triple \/ T-Valve","offer_id":48949591277720,"sku":"CQE-US-00324-T","price":232.8,"currency_code":"USD","in_stock":true},{"title":"Triple \/ Saddle Valve","offer_id":48949591310488,"sku":"CQE-US-00324-S","price":232.8,"currency_code":"USD","in_stock":true},{"title":"Triple \/ Both","offer_id":48949591343256,"sku":"CQE-US-00324-B","price":241.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0761\/5781\/2888\/files\/single-nitrate-under-sink-water-filter-system-crystal-quest-under-sink-water-filters-33135897575517.webp?v=1777594434","url":"https:\/\/www.truesteadsupply.com\/products\/crystal-quest-nitrate-under-sink-filtration-system","provider":"TrueStead Supply","version":"1.0","type":"link"}