{"product_id":"seachem-reef-builder","title":"Reef Builder — KH Alkalinity Without Immediate pH Impact 600 g and 1.2 kg - Seachem","description":"\u003cp\u003eSeachem Reef Builder is a powdered alkalinity supplement that increases carbonate hardness (KH) with minimal and gradual impact on pH. With long-term use, the pH stabilizes at 8.3. Its blend of carbonate sources does not deplete calcium, magnesium, or strontium, unlike competing products based solely on sodium bicarbonate. Available in 600 g and 1.2 kg — the larger size is the economical choice for aquarists who regularly dose alkalinity or use a dosing pump.\u003c\/p\u003e\n\n\u003ch2\u003eMain advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIncreases carbonate alkalinity (KH) without immediately affecting pH\u003c\/li\u003e\n\u003cli\u003eBlend of carbonate sources — does not lower pH like bicarbonate-only products\u003c\/li\u003e\n\u003cli\u003eDoes not deplete calcium, magnesium, or strontium\u003c\/li\u003e\n\u003cli\u003eEconomical 1.2 kg format for regular and automated dosing\u003c\/li\u003e\n\u003cli\u003eCompatible with pre-mixed solution dosing pumps\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eUse in reef aquariums\u003c\/h2\u003e\n\u003cp\u003eCarbonate alkalinity is essential for the growth of all corals. Seachem recommends maintaining alkalinity between 3 and 5 meq\/L (8–14 dKH), never dropping below 2 meq\/L. Reef Builder and Seachem Reef Buffer can be used together: Reef Builder to increase alkalinity without changing pH, Reef Buffer to increase both alkalinity and pH simultaneously. When pH is not a concern, Reef Builder is the first choice for adjusting alkalinity.\u003c\/p\u003e\n\n\u003ch2\u003eDosage\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBeginner: 3 g (½ level teaspoon) per 150 L (40 US gallons), twice a week. Dissolve in at least 250 ml (1 cup) of fresh water. Check alkalinity every 2 weeks.\u003c\/li\u003e\n\u003cli\u003eAdvanced: dose until alkalinity reaches 3–6 meq\/L (8–17 dKH). Each 3 g dose per 150 L raises alkalinity by 0.25 meq\/L. Do not exceed 12 g per 150 L per day.\u003c\/li\u003e\n\u003cli\u003eExpert: determine the consumption rate and set up a continuous drip. Formula: m = 0.08 × v × a (m = grams, v = volume in liters, a = increase in meq\/L).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePreparing for a dosing pump\u003c\/h2\u003e\n\u003cp\u003eAccording to Seachem, 1 teaspoon of Reef Builder dissolves in 150 ml of liquid, which is 33.3 g per liter of RO\/DI water. The 1.2 kg size makes over 35 liters of concentrated solution. It is normal for the pre-mixed solution to be slightly cloudy — add it to the tank after a few minutes of rest. Small amounts of calcium carbonate may form if the solution sits for a long time, but they dissolve in the aquarium volume.\u003c\/p\u003e\n\n\u003ch2\u003eManufacturer's precautions\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDo not exceed 12 g per 150 L per day\u003c\/li\u003e\n\u003cli\u003eExcess alkalinity can accelerate the loss of calcium, magnesium, and strontium\u003c\/li\u003e\n\u003cli\u003eDo not mix directly with a calcium, magnesium, or strontium supplement — alternate days or wait at least 30 minutes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAvailable formats\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e600 g\u003c\/li\u003e\n\u003cli\u003e1.2 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy choose Reef Builder at ReefSolution\u003c\/h2\u003e\n\u003cp\u003eThe 600 g covers the needs of a typical reef tank; the 1.2 kg is ideal for aquarists who go through alkalinity regularly, especially SPS tanks with dosing pumps. Pair Reef Builder with \u003ca href=\"\/en\/products\/seachem-reef-advantage-calcium\"\u003e\u003cstrong\u003eReef Advantage Calcium\u003c\/strong\u003e\u003c\/a\u003e for calcium and \u003ca href=\"\/en\/products\/reef-buffer-500g\"\u003e\u003cstrong\u003eReef Buffer\u003c\/strong\u003e\u003c\/a\u003e if pH also needs correcting. The equivalent liquid version is \u003ca href=\"\/en\/products\/seachem-reef-carbonate-500ml\"\u003e\u003cstrong\u003eReef Carbonate\u003c\/strong\u003e\u003c\/a\u003e, and for two-bottle calcium + alkalinity dosing, \u003ca href=\"\/en\/products\/seachem-reef-fusion-2\"\u003e\u003cstrong\u003eReef Fusion 2\u003c\/strong\u003e\u003c\/a\u003e is the alkalinity half of Seachem's two-part system. Monitor your parameters with a reliable alkalinity test kit.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eIs the 1.2 kg size worthwhile for automated dosing?\u003c\/h3\u003e\n\u003cp\u003eYes. The 1.2 kg size makes more than 35 liters of concentrated dosing-pump solution (33.3 g per liter of RO\/DI water). Ideal for systems with high alkalinity consumption and daily dosing.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is the difference between Reef Builder and Reef Carbonate?\u003c\/h3\u003e\n\u003cp\u003eReef Builder is the powder version, while Reef Carbonate (4000 meq\/L) is the liquid version. Both give the same end result. Powder is more economical for large volumes; liquid is easier to dose without pre-mixing.\u003c\/p\u003e\n\n\u003ch3\u003eDoes Reef Builder affect aquarium pH?\u003c\/h3\u003e\n\u003cp\u003eNot immediately. Reef Builder raises alkalinity with minimal pH impact. With long-term use, pH tends to stabilize at 8.3. To raise pH right away, use Seachem Reef Buffer.\u003c\/p\u003e","brand":"Seachem","offers":[{"title":"600 g","offer_id":47580654502059,"sku":"20062","price":22.99,"currency_code":"CAD","in_stock":true},{"title":"1.2 kg","offer_id":38010069680299,"sku":"000116036702","price":39.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0513\/7108\/1899\/files\/81UPq25UJeL._AC_SL1500.jpg?v=1773609029","url":"https:\/\/reefsolution.com\/en\/products\/seachem-reef-builder","provider":"Reef Solution","version":"1.0","type":"link"}