{"product_id":"pcs-cal-mag-fe-hydroponic-supplement-australia","title":"PCS Cal-Mag + Fe | Calcium Magnesium Iron Supplement Australia","description":"\u003cdiv class=\"quick-answer-box\"\u003e\n\u003ch2 class=\"quick-answer-title\"\u003eQuick Answer\u003c\/h2\u003e\n\u003cul class=\"quick-answer-list\"\u003e\n\u003cli\u003eCalcium, magnesium and iron supplement, NPK 3-0-0, with 1% Mg and 0.6% Fe alongside the calcium.\u003c\/li\u003e\n\u003cli\u003ePart of the feed guide every week of both veg and flower, dose steps up from 0.5ml to 1ml per litre partway through each stage.\u003c\/li\u003e\n\u003cli\u003eParticularly relevant on RO water, soft tap water, or any coco setup where these three elements run short first.\u003c\/li\u003e\n\u003cli\u003eSuits hydroponic, coco and soil systems.\u003c\/li\u003e\n\u003cli\u003eSizes: 1L, 5L, 20L, with 200L and 1000L available for commercial orders.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cem\u003eSame high grade inputs as the more expensive imported brands, manufactured right here in Australia, without the import price tag.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp\u003eCalcium, magnesium and iron each do something a plant cannot substitute with another nutrient. Calcium builds and strengthens developing cell walls as new tissue forms, magnesium sits at the centre of every chlorophyll molecule a plant uses to photosynthesise, and iron drives the enzyme activity behind that same chlorophyll production and a range of other metabolic processes. PCS Cal-Mag + Fe supplies all three directly, on top of what Grow A\u0026amp;B and Bloom A\u0026amp;B already carry.\u003c\/p\u003e\n\n\u003cp\u003eThese three are also the ones that run short first once a setup pushes past the basics, RO water and naturally soft tap water both carry less calcium and magnesium than a plant needs, and fast growth under high intensity LED lighting increases demand for all three faster than a base nutrient alone is built to keep up with. Left short, the visible result is usually weak new growth or the interveinal yellowing that shows up when magnesium or iron cannot keep pace. Topping these three up before that shortfall becomes visible is what this additive is actually doing in the feed guide.\u003c\/p\u003e\n\n\u003ch2\u003eHow to Use\u003c\/h2\u003e\n\u003cp\u003eDuring veg, run 0.5ml per litre through weeks 1 to 3, stepping to 1ml per litre from week 4 to week 6. During flower, the same 0.5ml per litre applies through weeks 1 to 3, then 1ml per litre from week 4 through to week 8. Add alongside your base nutrient in the reservoir, no separate mixing order required.\u003c\/p\u003e\n\n\u003ch2\u003eSuitable For\u003c\/h2\u003e\n\u003cp\u003eHydroponic, coco and soil systems, particularly where RO or soft water is in use.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Bought Together\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/pcs-grow-ab-hydroponic-nutrient-australia\"\u003e\u003cstrong\u003ePCS Grow A \u0026amp; B\u003c\/strong\u003e\u003c\/a\u003e, the vegetative base Cal-Mag + Fe supplements throughout veg.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/pcs-bloom-ab-hydroponic-nutrient-australia\"\u003e\u003cstrong\u003ePCS Bloom A \u0026amp; B\u003c\/strong\u003e\u003c\/a\u003e, the flowering base Cal-Mag + Fe continues supporting through bloom.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/pcs-fulvic-bioactive-plant-supplement-australia\"\u003e\u003cstrong\u003ePCS Fulvic\u003c\/strong\u003e\u003c\/a\u003e, helps chelate and transport the calcium, magnesium and iron this product supplies, so more of what you add actually reaches the plant.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eDo I need Cal-Mag + Fe if I am already running Grow or Bloom A\u0026amp;B?\u003c\/h3\u003e\n\u003cp\u003eThe base nutrients already carry calcium, magnesium and some iron. This additive is a supplemental top up for setups where demand outpaces what the base alone supplies, particularly RO water, soft tap water and coco, where these three elements typically run short first.\u003c\/p\u003e\n\u003ch3\u003eDoes the dose stay the same across the whole cycle?\u003c\/h3\u003e\n\u003cp\u003eNo. It steps up from 0.5ml to 1ml per litre partway through both the veg and flower feed guides, rather than running flat the whole way through, matching the plant's increasing demand for these three elements as growth accelerates.\u003c\/p\u003e\n\u003ch3\u003eWhat sizes does Cal-Mag + Fe come in?\u003c\/h3\u003e\n\u003cp\u003e1L, 5L and 20L are stocked here, with 200L and 1000L available directly from PCS for larger commercial setups.\u003c\/p\u003e\n\u003cp\u003eFor the full PCS range, browse the \u003ca href=\"\/collections\/premium-crop-solutions\"\u003ePremium Crop Solutions collection\u003c\/a\u003e.\u003c\/p\u003e","brand":"Apex Grow","offers":[{"title":"1L","offer_id":43740410019903,"sku":null,"price":35.0,"currency_code":"AUD","in_stock":true},{"title":"5L","offer_id":43740410052671,"sku":null,"price":131.5,"currency_code":"AUD","in_stock":true},{"title":"20L","offer_id":43740410085439,"sku":null,"price":320.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/6898\/8479\/files\/1L_CalMag_thumb_8ea026c9-5f3a-494f-90ae-858e5f1c97b1.png?v=1786652490","url":"https:\/\/apexgrow.com.au\/products\/pcs-cal-mag-fe-hydroponic-supplement-australia","provider":"Apex Grow","version":"1.0","type":"link"}