{"product_id":"plagron-calmag-pro","title":"Plagron CalMag Pro for RO and Soft Water Grows","description":"\u003ch2\u003eBuild your nutrient water on the right foundation\u003c\/h2\u003e\u003cp\u003eA shortage of \u003cstrong\u003ecalcium and magnesium\u003c\/strong\u003e in \u003cstrong\u003ereverse osmosis and soft water\u003c\/strong\u003e is one of the best-known problems in indoor growing, and one of the easiest to fix. \u003cstrong\u003ePlagron CalMag Pro\u003c\/strong\u003e puts a balanced concentration of these minerals back into your water before anything else goes in, giving you a consistent starting point for the rest of the feed. Crucially it holds the \u003cstrong\u003eoptimal calcium to magnesium ratio\u003c\/strong\u003e, so the two elements do not compete with one another at the root.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimal Ca\/Mg ratio\u003c\/strong\u003e prevents the two nutrients competing for uptake.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoth elements in one product\u003c\/strong\u003e - many calcium and magnesium fertilisers cannot be mixed because of sulphates, CalMag Pro carries both in the correct proportion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade for RO and soft water\u003c\/strong\u003e, the two supplies most likely to leave plants short.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA stable base for nutrient water\u003c\/strong\u003e, so the base feed that follows behaves predictably.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple to slot in\u003c\/strong\u003e ahead of any brand of base nutrient.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePale New Growth on a Full-Strength Feed\u003c\/h3\u003e\u003cp\u003eWater with almost nothing in it looks clean on an EC meter but leaves plants short from the first feed. The symptoms are familiar: interveinal yellowing, rusty spots on older leaves, weak stems and slow growth, all of which are really poor nutrient uptake caused by a missing foundation rather than a weak base feed. Correcting calcium and magnesium first means the EC you dial in is doing the job you think it is.\u003c\/p\u003e\u003ch3\u003eHow to Use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRO and soft water:\u003c\/strong\u003e add CalMag Pro to plain water first, before any base nutrient, and stir well.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoco:\u003c\/strong\u003e use with every feed, as coco holds onto calcium and can leave plants short early on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoil:\u003c\/strong\u003e use where your supply is soft or filtered and leaves are showing shortage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMixing order:\u003c\/strong\u003e CalMag Pro, then base feed A, then B, then boosters - one at a time, stirring between each.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH:\u003c\/strong\u003e check and adjust only once the full solution is mixed, as adding minerals moves the reading.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"hcs-specs\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Calcium and magnesium supplement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormulated for:\u003c\/strong\u003e Reverse osmosis water and soft water\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRatio:\u003c\/strong\u003e Optimal calcium to magnesium proportion to prevent competition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse point:\u003c\/strong\u003e Added to water before base nutrients\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDosage:\u003c\/strong\u003e As stated on the product label\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Plagron","offers":[{"title":"500ml","offer_id":53445688066314,"sku":null,"price":8.49,"currency_code":"GBP","in_stock":true},{"title":"1 Litre","offer_id":53445688099082,"sku":null,"price":14.49,"currency_code":"GBP","in_stock":true},{"title":"5 Litre","offer_id":53445688131850,"sku":null,"price":60.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/calmag_pro.jpg?v=1785289643","url":"https:\/\/hydrocropshop.co.uk\/products\/plagron-calmag-pro","provider":"Hydro Crop Shop","version":"1.0","type":"link"}