{"product_id":"seachem-phosguard-100ml-sachet","title":"PhosGuard 100 ml Sachet — Spherical Anti-Phosphate Aluminum Oxide | Seachem","description":"\u003cp\u003e Seachem PhosGuard 100ml pre-packaged filter media is a spherical aluminum oxide-based filter media that quickly removes phosphates and silicates from marine and freshwater aquariums. Its unique spherical bead shape—unique in the phosphate remover market—promotes optimal water flow through the media, increasing its efficiency and capacity compared to competing granular media that compact and limit contact with water.\u003c\/p\u003e\n\n\n\u003ch2\u003e Main advantages\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e Rapidly removes phosphates and silicates — capacity of 0.87 mg PO4\/g\u003c\/li\u003e\n\n\u003cli\u003e Unique spherical shape on the market — optimal water flow, no compaction\u003c\/li\u003e\n\n\u003cli\u003e Irreversible bond — does not release phosphates or silicates into the water\u003c\/li\u003e\n\n\u003cli\u003e Ready-to-use 100ml sachet format — ideal for aquariums up to 235 L (60 US gallons)\u003c\/li\u003e\n\n\u003cli\u003e Inert and safe — can remain in the filter without risk\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\u003ch2\u003e Use in reef and marine aquariums\u003c\/h2\u003e\n\n \u003cp\u003eHigh phosphate levels promote the growth of unwanted algae and are detrimental to coral health. PhosGuard absorbs phosphates very quickly—reaching full capacity in 4 to 5 days in the presence of high phosphates. This rapid replacement rate is a sign of efficiency, not low capacity. Seachem recommends using small amounts continuously rather than large amounts intermittently. PhosGuard works best in saltwater and at alkaline or neutral pH. Under reef conditions (pH close to 8), no detectable soluble aluminum is released.\u003c\/p\u003e\n\n\n\u003ch2\u003e Instructions for use\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e The 100ml sachet is pre-packaged and ready to use.\u003c\/li\u003e\n\n\u003cli\u003e Place in a cartridge filter, media chamber, box filter or any high-flow area — do not use in a media reactor (agitation produces dust)\u003c\/li\u003e\n\n\u003cli\u003e Dosage: 85 ml (⅓ cup) per 200 L (50 US gallons) of seawater or 400 L (100 US gallons) of freshwater\u003c\/li\u003e\n\n \u003cli\u003eLeave in place for 4 days, then test the phosphates. If the concentration has not decreased to 0.02 mg\/L, replace the PhosGuard.\u003c\/li\u003e\n\n\u003cli\u003e If the levels remain under control, the product is not depleted — leave in place\u003c\/li\u003e\n\n\u003cli\u003e Test phosphate levels weekly until they rise to determine when to replace\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\u003ch2\u003e Manufacturer's precautions\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e May generate heat upon first contact with water — pre-wet by adding the product to twice its volume of fresh water. Do not add water to the dry product. Do not use seawater for the initial wetting (risk of boiling).\u003c\/li\u003e\n\n\u003cli\u003e The yellowing of the medium indicates the absorption of organic compounds, not the depletion of phosphates.\u003c\/li\u003e\n\n\u003cli\u003e Do not overdose — too rapid a drop in phosphates can stress sensitive corals\u003c\/li\u003e\n\n\u003cli\u003e Aluminium oxide is NOT regenerable — cooking does not restore its ability to absorb phosphates.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\u003ch2\u003e Comparison of Seachem anti-phosphates\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e PhosGuard (aluminum oxide): 0.87 mg PO4\/g\u003c\/li\u003e\n\n \u003cli\u003ePhosBond (hybrid GFO + aluminum oxide): 1.19 mg PO4\/g\u003c\/li\u003e\n\n\u003cli\u003e PhosNet (GFO): 1.41 mg PO4\/g\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\u003ch2\u003e Available formats\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e 100 ml (sachet)\u003c\/li\u003e\n\n\u003cli\u003e 250 ml\u003c\/li\u003e\n\n\u003cli\u003e 500 ml\u003c\/li\u003e\n\n\u003cli\u003e 1 L\u003c\/li\u003e\n\n\u003cli\u003e 2 L\u003c\/li\u003e\n\n\u003cli\u003e 4 L\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\u003ch2\u003e Why choose PhosGuard from ReefSolution?\u003c\/h2\u003e\n\n\u003cp\u003e The 100ml sachet is ideal for nano aquariums or as a first phosphate treatment. For superior binding capacity, consider Seachem PhosBond (GFO + aluminum oxide hybrid) or Seachem PhosNet (pure GFO). Monitor your phosphate levels with the Hanna Checker Phosphate or the Salifert Phosphate Test Kit. Place PhosGuard inside the Seachem The Bag for bulk quantities.\u003c\/p\u003e\n\n\n\u003ch2\u003e Frequently Asked Questions\u003c\/h2\u003e\n\n\n\u003ch3\u003e Can PhosGuard be used in a media reactor?\u003c\/h3\u003e\n\n\u003cp\u003e No. Seachem does not recommend it because agitation in a reactor can reduce the media to dust. Use in a cartridge filter, media chamber, or any area with high static flow.\u003c\/p\u003e\n\n\n\u003ch3\u003e Does PhosGuard release aluminum that is toxic to corals?\u003c\/h3\u003e\n\n \u003cp\u003eNo. Seachem's controlled studies demonstrate that under reef conditions (pH close to 8), no detectable soluble aluminum is released. Even at three times the prescribed dosage, soft corals remain unaffected.\u003c\/p\u003e\n\n\n\u003ch3\u003e Why does PhosGuard need to be replaced every 4 days?\u003c\/h3\u003e\n\n\u003cp\u003e Frequent replacement is a sign of effectiveness, not low capacity. PhosGuard absorbs phosphates so quickly that it reaches full capacity in 4 to 5 days in the presence of high phosphates. Once levels are under control (below 0.02 mg\/L), leave it in place and test weekly.\u003c\/p\u003e","brand":"Seachem","offers":[{"title":"Default Title","offer_id":38010196525227,"sku":"000116018500","price":9.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0513\/7108\/1899\/files\/s-l1600_46d0785d-205a-4629-87fa-57ee4d37e138.jpg?v=1773611410","url":"https:\/\/reefsolution.com\/en\/products\/seachem-phosguard-100ml-sachet","provider":"Aquarium ReefSolution inc.","version":"1.0","type":"link"}