{"product_id":"ultra-high-purity-di-resin-cartridge","title":"Ultra High Purity DI Resin Cartridge","description":"\u003cp\u003e\u003cstrong\u003eWater spots on a freshly washed car. Algae in a reef tank that keeps coming back. Lab results thrown off by trace minerals.\u003c\/strong\u003e Each comes down to the same thing: dissolved solids that ordinary filters, and even reverse osmosis, leave behind in small amounts. When the job needs water with almost nothing dissolved in it, the answer is deionization.\u003c\/p\u003e\u003cp\u003eThe Crystal Quest Ultra High Purity DI Resin Cartridge is a mixed bed deionization (DI) cartridge. It is filled with a blend of two ion exchange resins that together remove dissolved ionic contaminants and drive total dissolved solids (TDS) toward zero. It is built as the final polishing stage after reverse osmosis, for reef-keeping, laboratory water, rinsing and plating, and spot-free washing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNot intended for drinking use.\u003c\/strong\u003e This cartridge makes technical water for the uses above. See why below.\u003c\/p\u003e\u003ch3\u003eAt a glance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMixed bed DI resin\u003c\/strong\u003e that removes both positive and negative dissolved ions in one pass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra pure output:\u003c\/strong\u003e rated 14 to 18 megohm-cm resistivity for the published slim sizes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade for polishing RO water,\u003c\/strong\u003e where it lasts many times longer than on tap water\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacity stated in grains,\u003c\/strong\u003e with gallons published at two feed water levels\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour sizes\u003c\/strong\u003e for standard 2.5\" and Big Blue housings\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat you are looking at\u003c\/h3\u003e\u003cp\u003eInside the cartridge is a bed of resin beads in two colors: dark beads of cation resin and light amber beads of anion resin, mixed together. A pad holds the bed in place and the cartridge seals into a standard housing. The two resins arrive fully charged, the cation resin in the hydrogen form and the anion resin in the hydroxide form, ready to trade those ions for whatever is dissolved in your water.\u003c\/p\u003e\u003ch3\u003eHow a DI resin cartridge works\u003c\/h3\u003e\u003ch4\u003eTwo resins, one result: water\u003c\/h4\u003e\u003cp\u003eDissolved solids are ions. Calcium, magnesium and sodium carry a positive charge; chloride, sulfate, nitrate and bicarbonate carry a negative charge. The strong acid cation resin captures every positive ion and releases a hydrogen ion in its place. The strong base anion resin captures every negative ion and releases a hydroxide ion. Hydrogen and hydroxide combine into pure water, so what leaves the cartridge is water with almost nothing dissolved in it.\u003c\/p\u003e\u003ch4\u003eWhy a mixed bed polishes so well\u003c\/h4\u003e\u003cp\u003eIn a mixed bed, the cation and anion beads sit side by side. Water passes through many alternating exchange steps on its way through the cartridge, so ions that slip past one bead are caught by the next. That is how a mixed bed reaches purity that separate resin stages cannot.\u003c\/p\u003e\u003ch4\u003eMeasuring purity: resistivity\u003c\/h4\u003e\u003cp\u003eThe fewer ions water carries, the worse it conducts electricity. DI water is graded by resistivity, in megohm-cm: the higher the number, the purer the water. A TDS meter reads close to zero on DI water, which is why high-purity users measure resistivity instead.\u003c\/p\u003e\u003ch4\u003eWhy it belongs after RO\u003c\/h4\u003e\u003cp\u003eDI capacity is measured in grains of dissolved solids, and every grain removed uses part of the resin. Feed it tap water and it spends its capacity on minerals that an RO membrane removes far more economically. Feed it RO water and the same resin lasts many times longer. Dissolved carbon dioxide also uses anion capacity, and chlorine damages resin, so the carbon and RO stages ahead of DI protect it.\u003c\/p\u003e\n\u003ch3\u003eWhat it reduces\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003ePrimary target:\u003c\/strong\u003e dissolved ionic contaminants and total dissolved solids (TDS) that RO leaves behind in small amounts, including:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHardness minerals: calcium and magnesium\u003c\/li\u003e\n\u003cli\u003eSodium and other dissolved metal ions\u003c\/li\u003e\n\u003cli\u003eChloride, sulfate, nitrate and bicarbonate (alkalinity)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eNot designed to treat:\u003c\/strong\u003e bacteria and viruses, sediment, chlorine and most dissolved organic chemicals, which carry no charge. Those belong to the sediment, carbon and RO stages ahead of the DI cartridge.\u003c\/p\u003e\u003ch3\u003eWhy it is not intended for drinking use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe minerals are gone.\u003c\/strong\u003e Tap water can contribute calcium and magnesium to your daily intake. DI water contributes almost none.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is \"hungry\" water.\u003c\/strong\u003e With nearly every ion removed and no buffering left, deionized water is easily contaminated and can corrode many of the materials it touches, and its pH drifts lower once it meets air.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt does not make water safe.\u003c\/strong\u003e DI resin does not remove bacteria or particles and does little for most organic chemicals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is a technical water product.\u003c\/strong\u003e Deionized water is used in laboratory and medical water systems. This cartridge is built for reef, lab, rinsing, plating and spot-free uses, and Crystal Quest makes no drinking water treatment claim for it. For low-TDS drinking water, choose a Crystal Quest \u003ca href=\"https:\/\/crystalquest.com\/collections\/under-sink-reverse-osmosis-filtration-systems\"\u003ereverse osmosis system\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWho uses it\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReef and aquarium keepers\u003c\/strong\u003e who want top-off and mixing water without the silicates, nitrate and phosphate that feed algae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLaboratories\u003c\/strong\u003e preparing water for testing, rinsing and reagents.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedical water systems\u003c\/strong\u003e that need deionized water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRinsing and plating operations\u003c\/strong\u003e where dissolved solids leave residue or spoil a finish.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpot-free washing\u003c\/strong\u003e of vehicles, windows and solar panels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectronics, optical and pharmaceutical production\u003c\/strong\u003e that needs very low TDS water.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhy Crystal Quest\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReal mixed bed resin,\u003c\/strong\u003e hydrogen and hydroxide form, ready to polish from the first gallon.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePublished performance:\u003c\/strong\u003e resistivity, grain capacity, gallons at two feed levels and flow for the slim sizes, in the Specifications tab.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltrapure systems experience:\u003c\/strong\u003e Crystal Quest builds RO and DI systems for homes, labs and commercial users.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver 1,000,000 people served since 1994.\u003c\/strong\u003e Crystal Quest builds under ISO 9001 quality management, has made water filtration in the USA for over 30 years and offers lifetime support by phone, email or chat.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhere it fits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAfter an RO system,\u003c\/strong\u003e as the final polishing stage before the point of use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountertop and under-sink DI housings\u003c\/strong\u003e that take the 2-7\/8\" x 9-3\/4\" or 2-7\/8\" x 20\" size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBig Blue housings\u003c\/strong\u003e for higher-volume polishing with the 4-5\/8\" sizes.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eChoose the size printed on your current cartridge or in your order history: 2-7\/8\" x 9-3\/4\" (CQE-RC-0500), 2-7\/8\" x 20\" (CQE-RC-0501), 4-5\/8\" x 9-3\/4\" (CQE-RC-0502) or 4-5\/8\" x 20\" (CQE-RC-0503).\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003cdiv class=\"cq-product-faq\"\u003e\n\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eWhat does a DI resin cartridge do?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eIts mixed bed resin swaps every dissolved positive ion for hydrogen and every negative ion for hydroxide, which combine into water. The result is water with very low total dissolved solids.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eIs a particular purity or zero TDS guaranteed?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eNo. The slim sizes are rated 14 to 18 megohm-cm, but output depends on your feed water, flow and how much capacity is left. Verify the output against your application's requirements.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eHow many gallons does a DI cartridge make?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eIt depends on the TDS going in. The 2-7\/8\" x 9-3\/4\" size is rated at 450 grains: about 33 gallons at 200 ppm feed, or about 680 gallons at 10 ppm feed, such as water from a well-performing RO system.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eDo I need reverse osmosis before a deionization filter cartridge?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eFor almost every use, yes. RO removes most dissolved solids first, so the DI resin only has to polish what is left and lasts many times longer.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eHow do I know when to replace it?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eMeasure the output with a resistivity or TDS meter and replace the cartridge when it no longer meets your application's requirement.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eWhat sizes are offered?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eFour: 2-7\/8\" x 9-3\/4\" and 2-7\/8\" x 20\" for standard 2.5\" housings, and 4-5\/8\" x 9-3\/4\" and 4-5\/8\" x 20\" for Big Blue housings.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n###\n\u003ch3\u003eDI resin cartridge specifications\u003c\/h3\u003e\u003cp\u003ePublished ratings apply to the selected cartridge and listed conditions. Capacity and output depend on feed water TDS, flow and usage. Contact Crystal Quest with the part number to confirm the flow and service plan for the 4-5\/8\" sizes.\u003c\/p\u003e\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"middle\"\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e\u003cb\u003eSIZE\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e\u003cb\u003eFITS HOUSING\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e\u003cb\u003eOPERATING \/ MAX FLOW\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e\u003cstrong\u003eCAPACITY\u003cbr\u003e(GRAINS AS CaCO3)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e\u003cstrong\u003eEST. GALLONS\u003cbr\u003e(200 PPM \/ 10 PPM FEED)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"middle\"\u003eCQE-RC-0500\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e2-7\/8\" x 9-3\/4\"\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e2.5\" x 10\"\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e0.2 \/ 0.3 gpm\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e450 grains*\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e33 \/ 680 gallons*\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"middle\"\u003eCQE-RC-0501\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e2-7\/8\" x 20\"\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e2.5\" x 20\"\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e0.4 \/ 0.6 gpm\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e900 grains*\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e66 \/ 1,360 gallons*\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"middle\"\u003eCQE-RC-0502\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e4-5\/8\" x 9-3\/4\"\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e5\" x 10\" Big Blue\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003eContact Crystal Quest to confirm\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003eContact Crystal Quest to confirm\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003eContact Crystal Quest to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"middle\"\u003eCQE-RC-0503\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e4-5\/8\" x 20\"\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003e5\" x 20\" Big Blue\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003eContact Crystal Quest to confirm\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003eContact Crystal Quest to confirm\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003eContact Crystal Quest to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eMedia and treatment\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMedia\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/de-ionizer\"\u003eDe-Ionizer\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTreatment method\u003c\/td\u003e\n\u003ctd\u003eIon exchange: cations exchanged for hydrogen, anions for hydroxide, which combine into water\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTargets\u003c\/td\u003e\n\u003ctd\u003eDissolved ionic contaminants and total dissolved solids\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput (2-7\/8\" sizes)\u003c\/td\u003e\n\u003ctd\u003e14 to 18 megohm-cm resistivity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUse\u003c\/td\u003e\n\u003ctd\u003eTechnical water only; not intended for drinking use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended feed\u003c\/td\u003e\n\u003ctd\u003eReverse osmosis treated water\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRegeneration\u003c\/td\u003e\n\u003ctd\u003eNone in the field. Replace when output no longer meets your requirement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eOperating conditions and materials (2-7\/8\" sizes)\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003e40°F (5°C) to 85°F (29°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure range\u003c\/td\u003e\n\u003ctd\u003e20 psi (1.4 bar) to 125 psi (8.6 bar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMicron rating\u003c\/td\u003e\n\u003ctd\u003e25 micron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCap and body\u003c\/td\u003e\n\u003ctd\u003eABS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePad\u003c\/td\u003e\n\u003ctd\u003ePE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGasket\u003c\/td\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e*Capacity and gallons are estimates. Actual life depends on feed water TDS, flow and usage.\u003c\/p\u003e\n","brand":"Crystal Quest Water Filters","offers":[{"title":"2-7\/8\" x 9-3\/4\" \/ Single","offer_id":67868437446889,"sku":"CQE-RC-0500","price":69.0,"currency_code":"USD","in_stock":true},{"title":"2-7\/8\" x 9-3\/4\" \/ Pack of 2","offer_id":67868437479657,"sku":"CQE-RC-0500-2PK","price":138.0,"currency_code":"USD","in_stock":true},{"title":"2-7\/8\" x 9-3\/4\" \/ Pack of 4","offer_id":67868437512425,"sku":"CQE-RC-0500-4PK","price":276.0,"currency_code":"USD","in_stock":true},{"title":"2-7\/8\" x 20\" \/ Single","offer_id":67868437545193,"sku":"CQE-RC-0501","price":129.0,"currency_code":"USD","in_stock":true},{"title":"2-7\/8\" x 20\" \/ Pack of 2","offer_id":67868437577961,"sku":"CQE-RC-0501-2PK","price":258.0,"currency_code":"USD","in_stock":true},{"title":"2-7\/8\" x 20\" \/ Pack of 4","offer_id":67868437610729,"sku":"CQE-RC-0501-4PK","price":516.0,"currency_code":"USD","in_stock":true},{"title":"4-5\/8\" x 9-3\/4\" \/ Single","offer_id":67868437643497,"sku":"CQE-RC-0502","price":134.0,"currency_code":"USD","in_stock":true},{"title":"4-5\/8\" x 9-3\/4\" \/ Pack of 2","offer_id":67868437676265,"sku":"CQE-RC-0502-2PK","price":268.0,"currency_code":"USD","in_stock":true},{"title":"4-5\/8\" x 9-3\/4\" \/ Pack of 4","offer_id":67868437709033,"sku":"CQE-RC-0502-4PK","price":536.0,"currency_code":"USD","in_stock":true},{"title":"4-5\/8\" x 20\" \/ Single","offer_id":67868437741801,"sku":"CQE-RC-0503","price":189.0,"currency_code":"USD","in_stock":true},{"title":"4-5\/8\" x 20\" \/ Pack of 2","offer_id":67868437774569,"sku":"CQE-RC-0503-2PK","price":378.0,"currency_code":"USD","in_stock":true},{"title":"4-5\/8\" x 20\" \/ Pack of 4","offer_id":67868437807337,"sku":"CQE-RC-0503-4PK","price":756.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0814\/4512\/6377\/files\/ultra-high-purity-di-resin-cartridge-crystal-quest-water-filter-cartridges-1263260528.webp?v=1793830201","url":"https:\/\/clearwaterworld.com\/products\/ultra-high-purity-di-resin-cartridge","provider":"Clearwater World","version":"1.0","type":"link"}