{"product_id":"seachem-flourish-potassium","title":"Seachem Flourish Potassium","description":"\u003cp\u003e\u003cstrong\u003eYellowing or pinholed leaves on your oldest plants are usually a potassium problem, and Seachem Flourish Potassium is a targeted fix.\u003c\/strong\u003e It's a potassium sulphate solution built for the Flourish planted-aquarium range, carrying no nitrate or phosphate so it can be dosed on its own schedule alongside the rest of your fertiliser routine. It suits any freshwater planted aquarium showing the classic signs of potassium deficiency.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTargets potassium specifically\u003c\/strong\u003e — corrects chlorosis (yellowing) and necrosis (browning, tissue death) in older leaves, pinholing, and weak stems and roots.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo nitrate or phosphate\u003c\/strong\u003e — dose it without affecting either of those levels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReported safe for freshwater shrimp\u003c\/strong\u003e, including Amano shrimp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot removed by carbon filtration\u003c\/strong\u003e, so it keeps working alongside your usual filter media.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConcentrated\u003c\/strong\u003e — every size treats water for under 1c per litre, cheapest per litre in the 2 L bottle.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003eBarcode\u003c\/th\u003e\n\u003cth\u003eApprox. litres treated per bottle\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e100 mL\u003c\/td\u003e\n\u003ctd\u003e000116046503\u003c\/td\u003e\n\u003ctd\u003e~2,500 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e250 mL\u003c\/td\u003e\n\u003ctd\u003e000116046602\u003c\/td\u003e\n\u003ctd\u003e~6,250 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e500 mL\u003c\/td\u003e\n\u003ctd\u003e000116046305\u003c\/td\u003e\n\u003ctd\u003e~12,500 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2 L\u003c\/td\u003e\n\u003ctd\u003e000116046800\u003c\/td\u003e\n\u003ctd\u003e~50,000 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eActive constituent: potassium sulphate solution, supplying 50,000 mg\/L potassium.\u003c\/p\u003e\u003ch3\u003eWhich size do I need?\u003c\/h3\u003e\u003cp\u003eAll sizes work out to under 1c per litre of water treated, and the cost per litre drops as the bottle gets bigger — the 2 L bottle is the cheapest per litre, the 100 mL bottle the most convenient to start with. Note that the 2 L bottle ships with a larger dosing cap than the smaller sizes, so measure your dose rather than assuming one capful equals 5 mL on that size.\u003c\/p\u003e\u003ch3\u003eDosage and directions\u003c\/h3\u003e\u003cp\u003eStandard dose: 5 mL (one capful on the smaller sizes) per 125 L, 2–3 times weekly or as needed when older leaves show yellowing, browning or pinholing. Each dose raises potassium by roughly 2 mg\/L. Seachem doesn't sell a potassium test kit, so dosing here is guided by plant response and frequency rather than a target reading — Seachem's own guidance cites a wide range of workable potassium levels, roughly 30–120 ppm, with good results reported across that range.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSuitable for freshwater planted aquariums showing potassium deficiency symptoms in older leaves.\u003c\/li\u003e\n\u003cli\u003eReported safe for freshwater shrimp, including Amano shrimp.\u003c\/li\u003e\n\u003cli\u003eSeachem does not publish reef or marine dosing guidance for this product — treat it as a freshwater planted-tank product only.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSafety\u003c\/h3\u003e\u003cp\u003eSeachem does not publish a specific overdose warning or a pH\/KH impact statement for this product. As with any concentrated fertiliser, measure doses rather than pouring by eye, and watch plant and livestock response after starting or increasing a dose.\u003c\/p\u003e\u003ch3\u003eGoes well with\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/seachem-flourish-phosphorus\"\u003eSeachem Flourish Phosphorus\u003c\/a\u003e — corrects phosphorus deficiency, which often shows up alongside a potassium shortfall.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/seachem-flourish-trace\"\u003eSeachem Flourish Trace\u003c\/a\u003e — covers the trace elements this product doesn't supply.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eCovered by your rights under Australian Consumer Law in addition to any manufacturer guarantee. Ships Australia-wide from North Lakes, QLD.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eHow do I know if my tank needs this?\u003c\/h4\u003e\u003cp\u003eLook at the oldest leaves first — yellowing, browning at the edges, small holes (pinholing), or weak, thin stems are the classic signs of a potassium shortfall in a planted tank.\u003c\/p\u003e\u003ch4\u003eIs it safe for shrimp?\u003c\/h4\u003e\u003cp\u003eSeachem reports it as safe for freshwater shrimp, including Amano shrimp, when dosed as directed.\u003c\/p\u003e\u003ch4\u003eWill it affect my nitrate or phosphate levels?\u003c\/h4\u003e\u003cp\u003eNo — it's formulated without either, so you can dose potassium independently of your nitrogen and phosphorus routine.\u003c\/p\u003e\u003ch4\u003eDoes carbon filtration remove it?\u003c\/h4\u003e\u003cp\u003eNo, Seachem states it is not removed by carbon filtration.\u003c\/p\u003e\u003ch4\u003eWhy doesn't Seachem give a single fixed dose?\u003c\/h4\u003e\u003cp\u003eBecause there isn't a widely available hobby test kit for potassium, Seachem instead publishes a workable range and recommends adjusting frequency to how your plants respond, rather than dosing to a specific test result.\u003c\/p\u003e","brand":"Seachem","offers":[{"title":"100 mL","offer_id":55244173738275,"sku":null,"price":17.95,"currency_code":"AUD","in_stock":true},{"title":"250 mL","offer_id":55244173771043,"sku":null,"price":27.95,"currency_code":"AUD","in_stock":true},{"title":"500 mL","offer_id":55244173803811,"sku":null,"price":40.95,"currency_code":"AUD","in_stock":true},{"title":"2 L","offer_id":55244173836579,"sku":null,"price":150.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/0469-flourish_potassium-4_l-scaled.png?v=1782710723","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/seachem-flourish-potassium","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}