{"product_id":"gfo-granular-ferric-oxide-16-oz-bulk-reef-supply","title":"GFO | Granular Ferric Oxide | 16 oz | Bulk Reef Supply","description":"\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot qMYqUG_convSearchResultTextHighlightSafari\"\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-6a6254fd-daa4-83ea-b1b3-7539cfa64e1a-1\" data-is-intersecting=\"true\"\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-6a6254fd-daa4-83ea-b1b3-7539cfa64e1a-1\" data-turn-id-container=\"request-6a6254fd-daa4-83ea-b1b3-7539cfa64e1a-1\" data-testid=\"conversation-turn-4\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-15 [--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 data-conversation-screenshot-content=\"\" 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=\"e1013f3a-9d67-43ac-8d86-8dcd3aa81bd2\" data-turn-start-message=\"true\" 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\" 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 dark markdown-new-styling\"\u003e\n\u003ch2\u003eBulk Reef Supply GFO (Granular Ferric Oxide) – 16 oz\u003c\/h2\u003e\n\u003cp\u003eBulk Reef Supply GFO (Granular Ferric Oxide) is a premium phosphate-removal media designed to help reef keepers maintain ultra-low nutrient levels for healthier corals and cleaner aquariums. By efficiently adsorbing phosphate and silicate from aquarium water, BRS GFO helps reduce nuisance algae, improve coral coloration, and create a more stable environment for SPS, LPS, and soft corals.\u003c\/p\u003e\n\u003cp\u003eManufactured from high-capacity granular ferric oxide, this media is ideal for use in media reactors or high-flow media bags. Whether you're battling elevated phosphate or maintaining an established reef aquarium, BRS GFO is one of the most trusted solutions for long-term nutrient control.\u003c\/p\u003e\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eRapidly removes phosphate (PO₄) from aquarium water\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHelps reduce silicate to discourage diatom growth\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSupports vibrant coral coloration and healthy growth\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHelps control nuisance algae\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHigh-capacity granular ferric oxide media\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSuitable for media reactors or media bags\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSafe for reef and marine aquariums\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTrusted by reef hobbyists and professionals\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Control Phosphate?\u003c\/h3\u003e\n\u003cp\u003eExcess phosphate is one of the leading causes of nuisance algae and can inhibit skeletal growth in stony corals. Keeping phosphate within an appropriate range helps promote:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eImproved SPS coloration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFaster coral growth\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eReduced nuisance algae\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBetter water clarity\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLong-term reef stability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRegular phosphate management is an important part of maintaining a successful reef aquarium.\u003c\/p\u003e\n\u003ch3\u003ePremium Granular Ferric Oxide\u003c\/h3\u003e\n\u003cp\u003eBRS GFO is engineered with a high surface area, allowing it to effectively bind phosphate and silicate as water passes through the media. For maximum efficiency, use GFO in a media reactor with gentle flow to keep the media lightly tumbling. It can also be placed in a fine mesh media bag in a high-flow area of your sump or filter.\u003c\/p\u003e\n\u003cp\u003eReplace the media as phosphate levels begin to rise or according to your aquarium's nutrient demands.\u003c\/p\u003e\n\u003ch3\u003eIdeal For\u003c\/h3\u003e\n\u003cp\u003eBulk Reef Supply GFO is recommended for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eSPS reef aquariums\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMixed reef tanks\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLPS coral systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFish-only saltwater aquariums\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCoral propagation systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSumps and filtration systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMedia reactors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHigh-flow filter media bags\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e16 oz (454 g) container\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHigh-capacity granular ferric oxide (GFO)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eRemoves phosphate and silicate\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHelps reduce nuisance algae\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompatible with media reactors and media bags\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSuitable for all marine and reef aquariums\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLong-lasting filtration media\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Searched Keywords\u003c\/h3\u003e\n\u003cp\u003eBulk Reef Supply GFO, BRS GFO, granular ferric oxide, phosphate remover, reef aquarium phosphate media, GFO media, phosphate control reef tank, aquarium phosphate remover, silicate remover, reef filtration media, media reactor GFO, SPS phosphate control, reef nutrient management, Bulk Reef Supply filtration media, GFO for reef aquarium.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mt-3 w-full empty:hidden\"\u003e\n\u003cdiv class=\"text-center\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv data-conversation-screenshot-content=\"\" class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Bulk Reef Supply","offers":[{"title":"Default Title","offer_id":49757623714042,"sku":null,"price":42.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0570\/9044\/1404\/files\/GFO_GranularFerricOxide_16oz_BulkReefSupply.png?v=1785092194","url":"https:\/\/coralsunlimited.com\/products\/gfo-granular-ferric-oxide-16-oz-bulk-reef-supply","provider":"Corals Unlimited","version":"1.0","type":"link"}