{"product_id":"brightwell-reef-code-a-calcium","title":"Brightwell Aquatics Reef Code A","description":"\u003cp\u003e\u003cstrong\u003eBrightwell Reef Code A\u003c\/strong\u003e is the calcium half of Brightwell's balanced two-part calcium and alkalinity system for reef aquariums. Dosed in equal measure with \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/brightwell-reef-code-b-alkalinity\"\u003eReef Code B\u003c\/a\u003e, it replenishes the calcium, strontium, and trace minerals that corals, clams, and coralline algae pull from the water as they grow, in the same ratio found in natural seawater. Round out the big three with \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/brightwell-magnesion-magnesium\"\u003eMagnesion\u003c\/a\u003e magnesium, and browse more \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/brightwell-aquatics\"\u003eBrightwell Aquatics\u003c\/a\u003e reef care.\u003c\/p\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eHow the Two-Part System Works\u003c\/h3\u003e\n\u003cp\u003eGrowing corals and other reef life constantly pull calcium and carbonate (alkalinity) out of your water. Reef Code A and Reef Code B replace them together, in balance:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReef Code A\u003c\/strong\u003e supplies calcium plus strontium and minor and trace elements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReef Code B\u003c\/strong\u003e supplies the carbonates that make up alkalinity, your tank's buffering capacity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUsed in equal amounts, the two keep calcium and alkalinity rising or holding steady together, just as they occur in natural seawater. Bring magnesium into range first (1,290 to 1,320 ppm) with Magnesion so calcium and alkalinity stay in solution instead of precipitating out.\u003c\/p\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCalcium-bearing half of a balanced two-part calcium and alkalinity system\u003c\/li\u003e\n\u003cli\u003eAlso supplies strontium and reef trace minerals\u003c\/li\u003e\n\u003cli\u003eIonically balanced to natural seawater when dosed equally with Reef Code B\u003c\/li\u003e\n\u003cli\u003eSimplifies calcium and alkalinity maintenance\u003c\/li\u003e\n\u003cli\u003eReef safe, with no phosphate or silicate\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eDirections for Use\u003c\/h3\u003e\n\u003cp\u003eShake well before use and test your calcium level before dosing. Add 5 ml of Reef Code A per 25 gallons every other day, or as needed, to keep calcium in the 412 to 450 ppm range, and dose an equal amount of Reef Code B to hold alkalinity steady. Used this way, 250 ml treats up to 1,250 gallons. Adjust the dose up or down based on your test results and how quickly your tank consumes calcium.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBefore you start:\u003c\/strong\u003e bring magnesium to 1,290 to 1,320 ppm with Magnesion. Correct magnesium keeps calcium and carbonate from precipitating, so both stay available to your corals.\u003c\/p\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eChoose Your Size\u003c\/h3\u003e\n\u003ctable style=\"border-collapse:collapse;width:100%;margin:6px 0;font-size:0.95em;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background:#E0F7FA;\"\u003e\n\u003cth style=\"border:1px solid #B2EBF2;padding:5px 8px;text-align:left;\"\u003eSize\u003c\/th\u003e\n\u003cth style=\"border:1px solid #B2EBF2;padding:5px 8px;text-align:left;\"\u003eBest for\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003e\u003cstrong\u003e250 ml\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003eNano and smaller reef tanks, or trying the Reef Code system.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003e\u003cstrong\u003e500 ml\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003eMid-size reef tanks with steady calcium demand.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003e\u003cstrong\u003e1 L\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003eLarger or coral-heavy systems, with the best value per ml.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse:collapse;width:100%;margin:6px 0;font-size:0.95em;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003eBrightwell Aquatics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003eReef Code A, calcium component\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003e\u003cstrong\u003eSupplies\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003eCalcium, strontium, and trace minerals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003e\u003cstrong\u003eUse with\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003eReef Code B (equal amounts), plus Magnesion for magnesium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003e\u003cstrong\u003eBest for\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003eSaltwater reef aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003e\u003cstrong\u003eAvailable sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003e250 ml, 500 ml, 1 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003e\u003cstrong\u003eReef safe\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003e\u003cstrong\u003eCountry of origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #B2EBF2;padding:5px 8px;\"\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/brightwell-reef-code-b-alkalinity\"\u003eReef Code B\u003c\/a\u003e is the alkalinity half, dosed in equal amounts.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/brightwell-magnesion-magnesium\"\u003eMagnesion\u003c\/a\u003e keeps magnesium in range so calcium and alkalinity stay stable.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/brightwell-aquatics\"\u003eBrightwell Aquatics\u003c\/a\u003e is the full brand lineup.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/additives-supplements\"\u003eAdditives and supplements\u003c\/a\u003e for more reef dosing options.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #006064;padding-left:8px;\"\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDo I have to use Reef Code B as well?\u003c\/strong\u003e For a balanced system, yes. Reef Code A and B are designed to be dosed in equal amounts so calcium and alkalinity stay in the natural seawater ratio. Some tanks need slightly different amounts of each based on demand, so test and adjust.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy check magnesium first?\u003c\/strong\u003e Magnesium keeps calcium and carbonate dissolved. If magnesium is low, dosing calcium and alkalinity can cause them to precipitate out instead of feeding your corals. Hold magnesium at 1,290 to 1,320 ppm with Magnesion.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it safe for corals and inverts?\u003c\/strong\u003e Yes. Reef Code A is reef safe and contains no phosphate or silicate. Dose to your test results rather than guessing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow much do I need?\u003c\/strong\u003e A rough starting point is 5 ml per 25 gallons every other day, but every tank is different. Test calcium and alkalinity regularly and adjust the dose to match your tank's uptake.\u003c\/p\u003e","brand":"Brightwell Aquatics","offers":[{"title":"250 ml","offer_id":48742369362139,"sku":"RCA250","price":8.14,"currency_code":"USD","in_stock":true},{"title":"500 ml","offer_id":48742369394907,"sku":"RCA500","price":12.12,"currency_code":"USD","in_stock":true},{"title":"1 L","offer_id":48742369427675,"sku":"RCA1L","price":19.53,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/image_db2b08fc-d344-4274-b269-93e09cf86f26.jpg?v=1777901520","url":"https:\/\/squeakysaquatics.com\/products\/brightwell-reef-code-a-calcium","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}