{"product_id":"seachem-phosguard-1l","title":"PhosGuard 1 L — Spherical Anti-Phosphate Aluminum Oxide | Seachem","description":"\u003cp\u003e Seachem PhosGuard 1L is a bulk-format, 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—prevents clumping and maximizes water contact for superior effectiveness. The 1L size is the economical choice for large reef aquariums or aquarists who maintain continuous phosphate control with small, regular doses.\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 1L bulk format — economical, divisible into multiple treatment portions\u003c\/li\u003e\n\n \u003cli\u003eInert and safe — can remain in the filter indefinitely 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\u003e High phosphate levels promote the growth of unwanted algae and hinder coral growth and coloration. 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 effectiveness, not low capacity. Seachem recommends using small amounts continuously rather than large amounts intermittently. The 1 L format allows you to maintain a ready-to-use media inventory for several treatment cycles. PhosGuard works best in saltwater and alkaline 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\u003ePre-wet by adding the product to twice its volume of fresh water, then rinse. Do not add water to the dry product. Do not use seawater for the initial wetting (risk of excessive heat).\u003c\/li\u003e\n\n\u003cli\u003e Place in a filter bag (recommended) in a cartridge filter, media chamber, box filter, or any high-flow area — do not use in a media reactor\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\u003e Leave 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 it in place and test weekly.\u003c\/li\u003e\n\n\u003cli\u003e PhosGuard can be removed, dried, and put back into service as long as it is not exhausted.\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 — always pre-wet with fresh water when adding the product to the water, never the other way around\u003c\/li\u003e\n\n \u003cli\u003eThe 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 Aluminum oxide is NOT regenerable — cooking does not restore its absorption capacity\u003c\/li\u003e\n\n\u003cli\u003e Not recommended for phosphate-buffered freshwater aquariums\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 — rapid absorption, spherical shape\u003c\/li\u003e\n\n\u003cli\u003e PhosBond (GFO + aluminum oxide hybrid): 1.19 mg PO4\/g — intermediate capacity\u003c\/li\u003e\n\n\u003cli\u003e PhosNet (GFO): 1.41 mg PO4\/g — highest capacity per gram\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\u003eThe 1L format is ideal for aquarists who want a supply of phosphate-removing media ready for multiple treatment cycles. Place it in the Seachem The Bag for optimal use. For higher binding capacity per gram, consider Seachem PhosBond or Seachem PhosNet. Monitor your phosphate levels with the Hanna Checker Phosphate or the Salifert Phosphate Test Kit.\u003c\/p\u003e\n\n\n\u003ch2\u003e Frequently Asked Questions\u003c\/h2\u003e\n\n\n\u003ch3\u003e How many treatments does the 1L format provide?\u003c\/h3\u003e\n\n\u003cp\u003e At the standard dosage of 85 ml per 200 L of seawater, the 1 L format provides approximately 11 treatment doses. For a 200 L aquarium with controlled phosphate levels, this represents several months of continuous use.\u003c\/p\u003e\n\n\n\u003ch3\u003e What is the difference between PhosGuard, PhosBond and PhosNet?\u003c\/h3\u003e\n\n \u003cp\u003ePhosGuard (aluminum oxide, 0.87 mg PO4\/g) absorbs rapidly thanks to its unique spherical shape. PhosBond (GFO + aluminum oxide hybrid, 1.19 mg PO4\/g) offers intermediate absorption. PhosNet (pure GFO, 1.41 mg PO4\/g) has the highest absorption capacity per gram.\u003c\/p\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 this because the agitation reduces the media to dust. Use in a cartridge filter, media chamber, or any high-flow area with a filter bag such as the Seachem The Bag.\u003c\/p\u003e","brand":"Seachem","offers":[{"title":"Default Title","offer_id":38010075250859,"sku":"000116018708","price":31.99,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0513\/7108\/1899\/files\/19250_12.jpg?v=1773613984","url":"https:\/\/reefsolution.com\/en\/products\/seachem-phosguard-1l","provider":"Aquarium ReefSolution inc.","version":"1.0","type":"link"}