{"product_id":"floraflex-cal-mag-iron","title":"FloraFlex Cal+Mag+Iron","description":"\u003csection class=\"gh-product-listing\"\u003e\n\u003ch2\u003eFloraFlex Cal+Mag+Iron — Secondary Nutrient Supplement for Hydroponic Growing\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e Growers using RO water, coco coir, or hydroponic systems who need to correct calcium, magnesium, and iron deficiencies\u003c\/p\u003e\n\u003cdiv class=\"gh-our-thoughts\" role=\"note\" aria-label=\"Our thoughts\"\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eOur thoughts\u003c\/strong\u003e\u003cbr\u003eIf you're running RO water or growing in coco, you need this. Calcium and magnesium don't come cheap when you're relying on a sterile growing medium, and deficiency symptoms show up fast in hydro. FloraFlex Cal+Mag+Iron does the job cleanly — low residue, works with any base nutrient, and growers consistently prefer it to pricier alternatives.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003eFloraFlex Cal+Mag+Iron is a \u003cstrong\u003eliquid secondary nutrient supplement\u003c\/strong\u003e designed to correct common calcium, magnesium, and iron deficiencies in hydroponic systems, reverse osmosis water setups, and soilless growing media. It's formulated to work alongside the FloraFlex 2-part base nutrient system, though it's compatible with any nutrient programme. Simple, reliable supplementation that fixes deficiency symptoms quickly and prevents them from happening in the first place.\u003c\/p\u003e\n\u003ch3\u003eHow it compares\u003c\/h3\u003e\n\u003cp\u003eThis sits in the \u003cstrong\u003emid-market tier\u003c\/strong\u003e of cal-mag supplements — proper formulation without premium pricing.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned specifically to complement FloraFlex 2-part nutrients, but works with any base system\u003c\/li\u003e\n\u003cli\u003eLiquid formulation allows both reservoir feeding and foliar application flexibility\u003c\/li\u003e\n\u003cli\u003eUsers report it leaves less residue in the reservoir than leading competitors\u003c\/li\u003e\n\u003cli\u003eAvailable in multiple sizes from 1 gallon to 270 gallons — scales from hobby growers to commercial operations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUnlike some cal-mag products that muddy your reservoir, FloraFlex Cal+Mag+Iron is a clean formula that does its job without the buildup.\u003c\/p\u003e\n\u003ch3\u003eUsage guidance\u003c\/h3\u003e\n\u003cp\u003eFloraFlex Cal+Mag+Iron works across different feeding methods and growing scenarios:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReverse osmosis water users\u003c\/strong\u003e\u003cbr\u003eRO strips minerals completely, leaving your plants starting from zero. Add 2–4 mL per gallon of water during all growth stages. This prevents the deficiency before it happens rather than chasing it after symptoms show.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCoco coir growers\u003c\/strong\u003e\u003cbr\u003eCoco naturally binds calcium and magnesium, making them unavailable to plant roots even when they're in the medium. This supplement bypasses that bind and delivers what your plants actually need. Use 2–4 mL per gallon throughout the growing cycle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHydroponic system users\u003c\/strong\u003e\u003cbr\u003eWhether you're running DWC, NFT, or drip, add to your reservoir mix at the rates above. Works cleanly without clouding solution clarity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFoliar feeding for fast correction\u003c\/strong\u003e\u003cbr\u003eIf you spot deficiency symptoms (yellowing between leaf veins, weak stems, tip burn), spray directly onto plant material at 15 mL per gallon. Foliar application bypasses the root system and shows improvement within 3–7 days. Reservoir feeding takes 1–2 weeks but provides steady, systemic support.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Always adjust your final solution pH after mixing FloraFlex Cal+Mag+Iron with all other nutrients and additives. This supplement affects pH, so dial it in once everything is mixed.\u003c\/p\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNPK Ratio: \u003cstrong\u003e2-0-0\u003c\/strong\u003e (includes nitrogen to support leaf development)\u003c\/li\u003e\n\u003cli\u003eKey nutrients: \u003cstrong\u003eCalcium, Magnesium, Iron (chelated)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eFormulation: \u003cstrong\u003eLiquid concentrate\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eApplication methods: \u003cstrong\u003eReservoir feeding or foliar spray\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDosage (reservoir): \u003cstrong\u003e2–4 mL per gallon of water\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDosage (foliar): \u003cstrong\u003e15 mL per gallon of water\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAvailable sizes: \u003cstrong\u003e1 gallon (3.78L), 5 gallon (22.7L), 55 gallon (250L), 270 gallon (1250L)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat deficiencies it corrects\u003c\/h3\u003e\n\u003cp\u003eWatch for these symptoms, particularly in new growth:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalcium deficiency:\u003c\/strong\u003e Curling or deformed leaves, weak stems, poor root development, tip burn, or blossom-end rot on developing fruit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnesium deficiency:\u003c\/strong\u003e Yellowing between leaf veins (interveinal chlorosis) while veins stay green\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIron deficiency:\u003c\/strong\u003e Yellowing between leaf veins on new growth, similar to magnesium deficiency but shows in younger leaves first\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAdequate calcium and magnesium build strong cell walls, improve nutrient uptake, and support root development. Iron is critical for photosynthesis and energy transfer. In sterile growing environments, these secondaries are non-negotiable.\u003c\/p\u003e\n\u003ch3\u003eWho this is for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRO water users who've stripped their water of all minerals\u003c\/li\u003e\n\u003cli\u003eCoco coir growers dealing with nutrient binding issues\u003c\/li\u003e\n\u003cli\u003eHydroponic system operators running DWC, NFT, drip, or flood-and-drain setups\u003c\/li\u003e\n\u003cli\u003eGrowers using soft water or distilled water\u003c\/li\u003e\n\u003cli\u003eAnyone running hard on their plants during rapid growth or development phases\u003c\/li\u003e\n\u003cli\u003eExisting FloraFlex 2-part users wanting complete system integration\u003c\/li\u003e\n\u003cli\u003eCommercial operations scaling from hobby to wholesale production\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eOur take\u003c\/h3\u003e\n\u003cp\u003eThis is essential kit for anyone serious about hydroponic growing. RO water and coco coir are brilliant growing media — but they come with a cost: you have to manage secondary nutrients yourself. FloraFlex Cal+Mag+Iron removes the guesswork and delivers what your plants are actually missing.\u003c\/p\u003e\n\u003cp\u003eWhat tips it over the edge for us is the clean formula and the flexibility — reservoir feeding for prevention, foliar feeding for emergency correction. You're not paying premium prices for advanced additives you don't need. You're getting a straightforward supplement that does exactly what it should, day in, day out.\u003c\/p\u003e\n\u003cp\u003eGood time to buy while stock lasts. Worth picking up if you're running RO or coco and haven't got a cal-mag supplement locked in yet.\u003c\/p\u003e\n\u003c\/section\u003e","brand":"FLORAFLEX","offers":[{"title":"Default Title","offer_id":47916366561450,"sku":"115367","price":34.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0053\/5540\/5400\/files\/1153671GALLONFLORAFLEXCAL_MAG_IRON_4c5ef769-c7d9-45ab-8482-b745808a36d9.jpg?v=1769192453","url":"https:\/\/growershouse.co.uk\/products\/floraflex-cal-mag-iron","provider":"Growers House ","version":"1.0","type":"link"}