{"product_id":"nt-labs-test-hardness-gh-kh","title":"NT LABS Test Hardness (GH \/ KH)","description":"\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-WEB:2ea47089-8f87-4c8f-ac98-7edfd8a12cb9-3\" data-is-intersecting=\"true\"\u003e\n\u003cdiv class=\"relative w-full overflow-visible\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:2ea47089-8f87-4c8f-ac98-7edfd8a12cb9-3\" data-turn-id-container=\"request-WEB:2ea47089-8f87-4c8f-ac98-7edfd8a12cb9-3\" data-testid=\"conversation-turn-8\" data-scroll-anchor=\"false\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"ced7c654-79da-4791-a90f-89c0d4d8e997\" dir=\"auto\" data-message-model-slug=\"gpt-5-5\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\"\u003e\n\u003cp data-start=\"0\" data-end=\"198\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eNT Labs\u003c\/span\u003e\u003c\/span\u003e Test Hardness (GH \/ KH) is an aquarium water testing kit used to measure General Hardness (GH) and Carbonate Hardness (KH) levels in freshwater or marine tanks.\u003c\/p\u003e\n\u003cp data-start=\"200\" data-end=\"446\"\u003e\u003cstrong\u003eWhat is GH and KH?\u003c\/strong\u003e\u003cbr data-start=\"218\" data-end=\"221\"\u003eGeneral Hardness (GH) measures the amount of dissolved minerals in the water, mainly calcium and magnesium. These minerals are important for fish health, osmoregulation, plant growth, and the development of shrimp and snails.\u003c\/p\u003e\n\u003cp data-start=\"448\" data-end=\"670\"\u003eCarbonate Hardness (KH) measures the level of carbonates and bicarbonates in the water. KH acts as a buffer that helps stabilise pH and prevents sudden pH swings, which can be stressful or harmful to fish and aquatic life.\u003c\/p\u003e\n\u003cp data-start=\"672\" data-end=\"798\"\u003eBoth GH and KH are invisible to the naked eye, making regular testing important for maintaining a stable aquarium environment.\u003c\/p\u003e\n\u003cp data-start=\"800\" data-end=\"921\"\u003e\u003cstrong\u003eWhat are the recommended GH and KH levels?\u003c\/strong\u003e\u003cbr data-start=\"842\" data-end=\"845\"\u003eThe ideal GH and KH levels depend on the type of fish and plants being kept.\u003c\/p\u003e\n\u003cp data-start=\"923\" data-end=\"962\"\u003eFor most tropical freshwater aquariums, these are the ideal settings:\u003c\/p\u003e\n\u003cul data-start=\"963\" data-end=\"995\"\u003e\n\u003cli data-section-id=\"1tbsk5u\" data-start=\"963\" data-end=\"979\"\u003eGH: 4 – 12 dGH\u003c\/li\u003e\n\u003cli data-section-id=\"1f0msni\" data-start=\"980\" data-end=\"995\"\u003eKH: 3 – 8 dKH\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"997\" data-end=\"1164\"\u003eSoft water species such as discus or certain tetras may require lower hardness levels, while African cichlids and livebearers generally prefer harder water conditions.\u003c\/p\u003e\n\u003cp data-start=\"1166\" data-end=\"1373\"\u003e\u003cstrong\u003eWhat do I do if the GH or KH level is wrong?\u003c\/strong\u003e\u003cbr data-start=\"1210\" data-end=\"1213\"\u003eIf GH or KH levels are too low, mineral supplements, crushed coral, or hardness buffers can be added gradually to increase hardness and improve water stability.\u003c\/p\u003e\n\u003cp data-start=\"1375\" data-end=\"1517\"\u003eIf GH or KH levels are too high, partial water changes with softer water or reverse osmosis (RO) water may help reduce hardness levels safely.\u003c\/p\u003e\n\u003cp data-start=\"1519\" data-end=\"1621\"\u003eSudden changes in hardness should always be avoided, as rapid fluctuations can stress fish and plants.\u003c\/p\u003e\n\u003cp data-start=\"1623\" data-end=\"1634\"\u003e\u003cstrong\u003eHow to use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1636\" data-end=\"2066\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e- Ensure the test tube is clean.\u003cbr data-start=\"1666\" data-end=\"1669\"\u003e- Take a 5 ml sample of water into the test tube.\u003cbr data-start=\"1716\" data-end=\"1719\"\u003e- Add 1 drop of the GH or KH reagent and shake gently.\u003cbr data-start=\"1771\" data-end=\"1774\"\u003e- Continue adding drops one at a time, shaking after each drop, until the colour changes completely.\u003cbr data-start=\"1872\" data-end=\"1875\"\u003e- Count the number of drops used before the colour changes.\u003cbr data-start=\"1932\" data-end=\"1935\"\u003e- The number of drops added equals the GH or KH level in degrees of hardness (dGH \/ dKH).\u003cbr data-start=\"2022\" data-end=\"2025\"\u003e- Rinse the test tube thoroughly after use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"NT Labs","offers":[{"title":"Default Title","offer_id":48812462833921,"sku":"NT006","price":16.0,"currency_code":"SGD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0430\/9870\/1992\/files\/NTLABSTestHardness.png?v=1779175693","url":"https:\/\/eastoceansg.com\/products\/nt-labs-test-hardness-gh-kh","provider":"East Ocean Aquatic","version":"1.0","type":"link"}