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{"id":8354841657544,"title":"Seachem Reef Builder, 600 g","handle":"seachem-reef-builder-600-g","description":"\u003ch3\u003eSeachem Reef Builder, 600 g\u003c\/h3\u003e\n\u003cp id=\"b\"\u003eSeachem Reef Builder 600G Directions Beginner Use 3 g (1\/2\nlevel teaspoon) per 150 L (40 US gallons) twice a week. Dissolve in at least\n250 mL (1 cup) of freshwater. Check alkalinity every 2 weeks and adjust amount\nor frequency accordingly. For precise dosing, use the Seachem Digital Spoon\nScale. Advanced Check alkalinity (use MultiTest Marine pH \u0026amp; Alkalinity to test\nalkalinity levels), then follow addition regimen above until alkalinity is\nadjusted to 3-6 meq\/L (8-17 dKH). Each 3 g\/150 L will raise alkalinity by\nabout 0.25 meq\/L. Quantity or frequency can be adjusted, but do not exceed 12\ng\/150 L per day. Thereafter, use as required to maintain alkalinity. Expert\nAfter determining the alkalinity consumption rate, set up a continuous drip\nsystem. Use the following formula (or skip the math and use our Dosage\nCalculator) to determine how much to add to your top–off water: m=0.08va\n(m=grams to add to top off water, v=volume of tank in liters, a=amount to\nraise alkalinity in meq\/L). For example, if you want to raise your alkalinity\nby 1 meq\/L in a 200 liter tank, then you would add 0.08x200x1=16 g into the\ntop–off water. [For reference: 1 gallon=3.8 liters, 6 g=1 teaspoon]. DO NOT\nOVERDOSE: Excess alkalinity may enhance the loss of calcium, magnesium, and\nstrontium. Do not directly mix with any calcium, magnesium, or strontium\nsupplement. Best if calcium \u0026amp; carbonate additives are added on alternate days\nor at least 30 minutes apart. Water Volume Units US Gallons Liters Current\nAlkalinity meq\/L Desired Alkalinity meq\/L To reach your desired level use g (\ntspn) Do not exceed 12 g\/150 L (40 US gallons) per day Considerations Use to\ntest alkalinity levels. Reef alkalinity should ideally be maintained at 3-6\nmeq\/L (8-17 dKH). Alkalinity should not be allowed to fall below 2 meq\/L. It\nis advisable to make large adjustments slowly to avoid overshooting intended\nlevel or shocking corals and inverts. Dissolve in at least one cup of\nfreshwater. DO NOT OVERDOSE Do not exceed 12 g\/150 L (40 US gallons) per day.\nExcess alkalinity may enhance the loss of calcium, magnesium, and strontium.\nDo not directly mix with any calcium, magnesium, or strontium supplement. Best\nif calcium \u0026amp; carbonate additives are added on alternate days or at least 30\nminutes apart. P.when('A').execute(function(A) {\nA.on('a:expander:toggle_description:toggle:collapse', function(data) {\nwindow.scroll(0, data.expander.$expander[0].offsetTop-100); }); }); Box\nContains water treatment See more\u003c\/p\u003e \n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n \u003cul class=\"a\"\u003e\n \u003cli\u003eRaises carbonate alkalinity (KH) with minimal impact on pH\u003c\/li\u003e\n \u003cli\u003eA blend of carbonate sources that will not lower pH\u003c\/li\u003e\n \u003cli\u003eWill not deplete calcium, magnesium, or strontium\u003c\/li\u003e\n \u003c\/ul\u003e","published_at":"2026-11-14T20:49:47+11:00","created_at":"2026-11-14T18:34:20+11:00","vendor":"Seachem","type":"Water Treatments","tags":["pets_UK_Nov2026"],"price":22200,"price_min":22200,"price_max":22200,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":45256571683016,"title":"600 g","option1":"600 g","option2":null,"option3":null,"sku":"uk-B00025K1ES","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Seachem Reef Builder, 600 g - 600 g","public_title":"600 g","options":["600 g"],"price":22200,"weight":680,"compare_at_price":null,"inventory_management":"shopify","barcode":"000116036306","requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}],"images":["\/\/pawsplanetshop.com\/cdn\/shop\/files\/uk-B00025K1ES.jpg?v=1794641662","\/\/pawsplanetshop.com\/cdn\/shop\/files\/819uP813AiL.jpg?v=1794641662","\/\/pawsplanetshop.com\/cdn\/shop\/files\/81pHu0rUmVL.jpg?v=1794641662"],"featured_image":"\/\/pawsplanetshop.com\/cdn\/shop\/files\/uk-B00025K1ES.jpg?v=1794641662","options":["Size Name"],"media":[{"alt":null,"id":31385704956104,"position":1,"preview_image":{"aspect_ratio":0.45,"height":2422,"width":1090,"src":"\/\/pawsplanetshop.com\/cdn\/shop\/files\/uk-B00025K1ES.jpg?v=1794641662"},"aspect_ratio":0.45,"height":2422,"media_type":"image","src":"\/\/pawsplanetshop.com\/cdn\/shop\/files\/uk-B00025K1ES.jpg?v=1794641662","width":1090},{"alt":null,"id":31385704988872,"position":2,"preview_image":{"aspect_ratio":1.5,"height":1707,"width":2560,"src":"\/\/pawsplanetshop.com\/cdn\/shop\/files\/819uP813AiL.jpg?v=1794641662"},"aspect_ratio":1.5,"height":1707,"media_type":"image","src":"\/\/pawsplanetshop.com\/cdn\/shop\/files\/819uP813AiL.jpg?v=1794641662","width":2560},{"alt":null,"id":31385705021640,"position":3,"preview_image":{"aspect_ratio":0.75,"height":2048,"width":1536,"src":"\/\/pawsplanetshop.com\/cdn\/shop\/files\/81pHu0rUmVL.jpg?v=1794641662"},"aspect_ratio":0.75,"height":2048,"media_type":"image","src":"\/\/pawsplanetshop.com\/cdn\/shop\/files\/81pHu0rUmVL.jpg?v=1794641662","width":1536}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch3\u003eSeachem Reef Builder, 600 g\u003c\/h3\u003e\n\u003cp id=\"b\"\u003eSeachem Reef Builder 600G Directions Beginner Use 3 g (1\/2\nlevel teaspoon) per 150 L (40 US gallons) twice a week. Dissolve in at least\n250 mL (1 cup) of freshwater. Check alkalinity every 2 weeks and adjust amount\nor frequency accordingly. For precise dosing, use the Seachem Digital Spoon\nScale. Advanced Check alkalinity (use MultiTest Marine pH \u0026amp; Alkalinity to test\nalkalinity levels), then follow addition regimen above until alkalinity is\nadjusted to 3-6 meq\/L (8-17 dKH). Each 3 g\/150 L will raise alkalinity by\nabout 0.25 meq\/L. Quantity or frequency can be adjusted, but do not exceed 12\ng\/150 L per day. Thereafter, use as required to maintain alkalinity. Expert\nAfter determining the alkalinity consumption rate, set up a continuous drip\nsystem. Use the following formula (or skip the math and use our Dosage\nCalculator) to determine how much to add to your top–off water: m=0.08va\n(m=grams to add to top off water, v=volume of tank in liters, a=amount to\nraise alkalinity in meq\/L). For example, if you want to raise your alkalinity\nby 1 meq\/L in a 200 liter tank, then you would add 0.08x200x1=16 g into the\ntop–off water. [For reference: 1 gallon=3.8 liters, 6 g=1 teaspoon]. DO NOT\nOVERDOSE: Excess alkalinity may enhance the loss of calcium, magnesium, and\nstrontium. Do not directly mix with any calcium, magnesium, or strontium\nsupplement. Best if calcium \u0026amp; carbonate additives are added on alternate days\nor at least 30 minutes apart. Water Volume Units US Gallons Liters Current\nAlkalinity meq\/L Desired Alkalinity meq\/L To reach your desired level use g (\ntspn) Do not exceed 12 g\/150 L (40 US gallons) per day Considerations Use to\ntest alkalinity levels. Reef alkalinity should ideally be maintained at 3-6\nmeq\/L (8-17 dKH). Alkalinity should not be allowed to fall below 2 meq\/L. It\nis advisable to make large adjustments slowly to avoid overshooting intended\nlevel or shocking corals and inverts. Dissolve in at least one cup of\nfreshwater. DO NOT OVERDOSE Do not exceed 12 g\/150 L (40 US gallons) per day.\nExcess alkalinity may enhance the loss of calcium, magnesium, and strontium.\nDo not directly mix with any calcium, magnesium, or strontium supplement. Best\nif calcium \u0026amp; carbonate additives are added on alternate days or at least 30\nminutes apart. P.when('A').execute(function(A) {\nA.on('a:expander:toggle_description:toggle:collapse', function(data) {\nwindow.scroll(0, data.expander.$expander[0].offsetTop-100); }); }); Box\nContains water treatment See more\u003c\/p\u003e \n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n \u003cul class=\"a\"\u003e\n \u003cli\u003eRaises carbonate alkalinity (KH) with minimal impact on pH\u003c\/li\u003e\n \u003cli\u003eA blend of carbonate sources that will not lower pH\u003c\/li\u003e\n \u003cli\u003eWill not deplete calcium, magnesium, or strontium\u003c\/li\u003e\n \u003c\/ul\u003e"}
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Seachem Reef Builder, 600 g

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Seachem Reef Builder, 600 g

Seachem Reef Builder 600G Directions Beginner Use 3 g (1/2 level teaspoon) per 150 L (40 US gallons) twice a week. Dissolve in at least 250 mL (1 cup) of freshwater. Check alkalinity every 2 weeks and adjust amount or frequency accordingly. For precise dosing, use the Seachem Digital Spoon Scale. Advanced Check alkalinity (use MultiTest Marine pH & Alkalinity to test alkalinity levels), then follow addition regimen above until alkalinity is adjusted to 3-6 meq/L (8-17 dKH). Each 3 g/150 L will raise alkalinity by about 0.25 meq/L. Quantity or frequency can be adjusted, but do not exceed 12 g/150 L per day. Thereafter, use as required to maintain alkalinity. Expert After determining the alkalinity consumption rate, set up a continuous drip system. Use the following formula (or skip the math and use our Dosage Calculator) to determine how much to add to your top–off water: m=0.08va (m=grams to add to top off water, v=volume of tank in liters, a=amount to raise alkalinity in meq/L). For example, if you want to raise your alkalinity by 1 meq/L in a 200 liter tank, then you would add 0.08x200x1=16 g into the top–off water. [For reference: 1 gallon=3.8 liters, 6 g=1 teaspoon]. DO NOT OVERDOSE: Excess alkalinity may enhance the loss of calcium, magnesium, and strontium. Do not directly mix with any calcium, magnesium, or strontium supplement. Best if calcium & carbonate additives are added on alternate days or at least 30 minutes apart. Water Volume Units US Gallons Liters Current Alkalinity meq/L Desired Alkalinity meq/L To reach your desired level use g ( tspn) Do not exceed 12 g/150 L (40 US gallons) per day Considerations Use to test alkalinity levels. Reef alkalinity should ideally be maintained at 3-6 meq/L (8-17 dKH). Alkalinity should not be allowed to fall below 2 meq/L. It is advisable to make large adjustments slowly to avoid overshooting intended level or shocking corals and inverts. Dissolve in at least one cup of freshwater. DO NOT OVERDOSE Do not exceed 12 g/150 L (40 US gallons) per day. Excess alkalinity may enhance the loss of calcium, magnesium, and strontium. Do not directly mix with any calcium, magnesium, or strontium supplement. Best if calcium & carbonate additives are added on alternate days or at least 30 minutes apart. P.when('A').execute(function(A) { A.on('a:expander:toggle_description:toggle:collapse', function(data) { window.scroll(0, data.expander.$expander[0].offsetTop-100); }); }); Box Contains water treatment See more

Product Features

  • Raises carbonate alkalinity (KH) with minimal impact on pH
  • A blend of carbonate sources that will not lower pH
  • Will not deplete calcium, magnesium, or strontium

Buy with confidence as this product comes with 18 months full local warranty in Australia & New Zealand (unless otherwise stated in the overview).

This product also comes with the benefits of the Warranty. For further details please read our Warranty Guidelines.

You can also purchase 3 Year Extended Care. If you are interested please see our Extended Care Information.