{"product_id":"crystal-quest-classic-under-sink-filtration-system","title":"Crystal Quest Classic Under Sink Filtration System","description":"\u003ch2\u003eCrystal Quest Classic Under Sink Water Filtration System – 6-Stage Drinking Water Filter\u003c\/h2\u003e\n\u003cp\u003eThe Crystal Quest Classic Under Sink Water Filtration System is a point-of-use drinking water filter designed to install beneath a sink and supply filtered water through a dedicated faucet setup. It is available in Multistage Plus, Multistage Ultra, and Multistage Ultimate capacity options. Crystal Quest also offers separate under-sink specialty systems for concerns such as arsenic, fluoride, and nitrate removal, which should be selected as separate product types when those specific contaminants are the priority. The standard SMART Classic under-sink design uses six stages of filtration with one-micron filter pads, coconut shell granular activated carbon, ion exchange resin, Eagle Redox Alloy media, ceramic and tourmaline media, and final particle-reduction filtration. It has a listed 0.5 GPM maximum flow rate, 20–60 psi operating pressure, and compact 3.5\" L × 10.5\" H × 3.5\" W housing. Follow the installation manual for faucet, connection, and pressure-related setup requirements.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eUnder-Sink Filtration for Drinking Water\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis Crystal Quest Classic system is designed for point-of-use filtration beneath the sink rather than whole-house treatment. It keeps the filter housing out of sight while providing filtered water through the included faucet setup for drinking water and everyday point-of-use kitchen needs.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSix-Stage SMART Classic Filtration\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eWater travels through one-micron filter pads, coconut shell granular activated carbon, ion exchange resin, Eagle Redox Alloy media, ceramic and tourmaline media, and final particle-reduction filtration. These stages are designed to help reduce listed impurities, taste, odor, and particles when present in the water.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eMultiple Capacity and Specialty Filter Options\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eBuyers can choose Multistage Plus, Multistage Ultra, and Multistage Ultimate capacity options for the Classic system. Separate Crystal Quest under-sink specialty systems are available for arsenic, fluoride, nitrate removal, and other targeted drinking water concerns.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation Setup Should Follow the Manual\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe system uses standard 1\/4\" connections, with a 3\/8\" conversion package available when needed. The installation manual should be checked before setup to confirm the correct valve, faucet, and connection requirements for the home’s under-sink plumbing.\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 Classic under sink water filter system for drinking water filtration\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0761\/5781\/2888\/files\/undersink2.webp?v=1777510959\" 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 compact under-sink filter is built for households that want filtered drinking water without a countertop unit. It installs below the sink and pairs with a faucet setup for filtered water access at the sink.\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 filter type and connection option that match your water concerns and plumbing. Capacity, specialty contaminant focus, and valve selection should be confirmed before installation.\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 Classic under sink filter capacity and cartridge options\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0761\/5781\/2888\/files\/under-sink1.webp?v=1777510959\" 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 Classic Under Sink Water Filtration System Features \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnder-sink installation:\u003c\/strong\u003e Installs beneath the sink to keep the filter housing off the countertop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFaucet setup:\u003c\/strong\u003e Designed to supply filtered water through the included faucet setup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSix-stage filtration:\u003c\/strong\u003e Uses one-micron pads, coconut shell granular activated carbon, ion exchange resin, Eagle Redox Alloy media, and additional particle reduction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacity options:\u003c\/strong\u003e Available in 10,000, 20,000, and 30,000 gallon multistage configurations depending on selected model.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelated specialty systems:\u003c\/strong\u003e Crystal Quest also offers separate under-sink systems for arsenic, fluoride, nitrate removal, and other targeted water concerns.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact housing:\u003c\/strong\u003e Measures 3.5\" L × 10.5\" H × 3.5\" W.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection flexibility:\u003c\/strong\u003e Standard 1\/4\" connections are listed, with a 3\/8\" conversion package available when needed.\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 an under-sink filter option?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTrueStead Supply can help you compare capacity, specialty cartridge type, and installation requirements.\u003c\/p\u003e\n\u003cp\u003e✓ 10,000-30,000 gallon capacity options\u003cbr\u003e✓ Six-stage SMART Classic filtration\u003cbr\u003e✓ Under-sink drinking water setup\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 Classic 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;\"\u003eClassic 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, 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;\"\u003eFiltration Stages\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e6 stages\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eFilter Options\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eMultistage Plus, Multistage Ultra, and Multistage Ultimate capacity options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eMultistage Plus Capacity\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e10,000 gallons\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eMultistage Ultra Capacity\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e20,000 gallons\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eMultistage Ultimate Capacity\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e30,000 gallons\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;\"\u003eSuggested Flow Rate\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e0.5 GPM or less\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;\"\u003eConnections\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eStandard 1\/4\"; 3\/8\" conversion package available if needed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eFaucet \/ Installation 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\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eDimensions\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003e3.5\" L × 10.5\" H × 3.5\" W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eListed Product Attributes\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eBPA-free, ISO-certified, made in the USA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem; font-weight: bold;\"\u003eWater Source Requirement\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #D6D0C4; padding: 0.75rem;\"\u003eUse on cold potable water; follow the installation manual and local plumbing codes before setup.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eCrystal Quest Classic Under Sink Water Filter System Info\u003c\/h4\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0761\/5781\/2888\/files\/ClassicUndersinkDisposableManual23.pdf?v=1777510924\" target=\"_blank\"\u003eClassic Undersink Water Filter System\u003c\/a\u003e\u003c\/p\u003e","brand":"Crystal Quest","offers":[{"title":"Filters 10000 gallons Multistage PLUS \/ T-Valve","offer_id":48945597677720,"sku":"CQE-US-00300-T","price":169.0,"currency_code":"USD","in_stock":true},{"title":"Filters 10000 gallons Multistage PLUS \/ Saddle 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Valve","offer_id":48945597907096,"sku":"CQE-US-00302-S","price":219.0,"currency_code":"USD","in_stock":true},{"title":"Filters 30000 gallons Multistage ULTIMATE \/ Both","offer_id":48945597939864,"sku":"CQE-US-00302-B","price":227.95,"currency_code":"USD","in_stock":true},{"title":"Arsenic \/ T-Valve","offer_id":48945597972632,"sku":"CQE-US-00380-T","price":209.0,"currency_code":"USD","in_stock":true},{"title":"Arsenic \/ Saddle Valve","offer_id":48945598005400,"sku":"CQE-US-00380-S","price":209.0,"currency_code":"USD","in_stock":true},{"title":"Arsenic \/ Both","offer_id":48945598038168,"sku":"CQE-US-00380-B","price":217.95,"currency_code":"USD","in_stock":true},{"title":"Arsenic + SMART \/ T-Valve","offer_id":48945598070936,"sku":"CQE-US-00304-T","price":209.0,"currency_code":"USD","in_stock":true},{"title":"Arsenic + SMART \/ Saddle Valve","offer_id":48945598103704,"sku":"CQE-US-00304-S","price":209.0,"currency_code":"USD","in_stock":true},{"title":"Arsenic + SMART \/ Both","offer_id":48945598136472,"sku":"CQE-US-00304-B","price":217.95,"currency_code":"USD","in_stock":true},{"title":"Fluoride \/ T-Valve","offer_id":48945598169240,"sku":"CQE-US-00305-T","price":189.0,"currency_code":"USD","in_stock":true},{"title":"Fluoride \/ Saddle Valve","offer_id":48945598202008,"sku":"CQE-US-00305-S","price":189.0,"currency_code":"USD","in_stock":true},{"title":"Fluoride \/ Both","offer_id":48945598234776,"sku":"CQE-US-00305-B","price":197.95,"currency_code":"USD","in_stock":true},{"title":"Fluoride + SMART \/ T-Valve","offer_id":48945598267544,"sku":"CQE-US-00381-T","price":189.0,"currency_code":"USD","in_stock":true},{"title":"Fluoride + SMART \/ Saddle Valve","offer_id":48945598300312,"sku":"CQE-US-00381-S","price":189.0,"currency_code":"USD","in_stock":true},{"title":"Fluoride + SMART \/ Both","offer_id":48945598333080,"sku":"CQE-US-00381-B","price":197.95,"currency_code":"USD","in_stock":true},{"title":"Nitrate Removal \/ T-Valve","offer_id":48945598365848,"sku":"CQE-US-00307-T","price":189.0,"currency_code":"USD","in_stock":true},{"title":"Nitrate Removal \/ Saddle Valve","offer_id":48945598398616,"sku":"CQE-US-00307-S","price":189.0,"currency_code":"USD","in_stock":true},{"title":"Nitrate Removal \/ Both","offer_id":48945598431384,"sku":"CQE-US-00307-B","price":197.95,"currency_code":"USD","in_stock":true},{"title":"Nitrate Removal + SMART \/ T-Valve","offer_id":48945598464152,"sku":"CQE-US-00308-T","price":189.0,"currency_code":"USD","in_stock":true},{"title":"Nitrate Removal + SMART \/ Saddle Valve","offer_id":48945598496920,"sku":"CQE-US-00308-S","price":189.0,"currency_code":"USD","in_stock":true},{"title":"Nitrate Removal + SMART \/ Both","offer_id":48945598529688,"sku":"CQE-US-00308-B","price":197.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0761\/5781\/2888\/files\/under-sink1.webp?v=1777510959","url":"https:\/\/www.truesteadsupply.com\/products\/crystal-quest-classic-under-sink-filtration-system","provider":"TrueStead Supply","version":"1.0","type":"link"}