{"product_id":"hesi-calmag","title":"Hesi CalMag Calcium Magnesium Supplement","description":"\u003ch2\u003ePuts back what a filter or a soft supply leaves out\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eHesi CalMag\u003c\/strong\u003e supplies \u003cstrong\u003ecalcium and magnesium\u003c\/strong\u003e for growers on reverse osmosis, rainwater or naturally soft supplies, and for any room where high light intensity has pushed demand past what the base feed carries.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrects soft and RO water\u003c\/strong\u003e - restores what the supply or the filter does not provide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStops tip burn and interveinal yellowing\u003c\/strong\u003e - the two classic symptoms, and both look like overfeeding\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupports high-intensity lighting\u003c\/strong\u003e - transpiration under LED and CDM drives calcium demand up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible across the Hesi range\u003c\/strong\u003e - mixes without upsetting the base ratio\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks with any brand\u003c\/strong\u003e - not restricted to Hesi\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDeficiency symptoms at a perfectly sensible EC\u003c\/h3\u003e\u003cp\u003eYellowing between the veins of older leaves is magnesium; crisping on the newest tips is calcium. On soft or RO water a base feed cannot cover either, and raising EC makes matters worse rather than better because the missing elements simply are not in the feed.\u003c\/p\u003e\u003ch3\u003eHow to Use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRO and soft water:\u003c\/strong\u003e \u003cstrong\u003e1 ml per litre\u003c\/strong\u003e into plain water before the base feed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHard water:\u003c\/strong\u003e test first - usually unnecessary\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-intensity lighting:\u003c\/strong\u003e up to \u003cstrong\u003e2 ml per litre\u003c\/strong\u003e through peak flower\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMixing:\u003c\/strong\u003e never alongside a concentrated phosphate feed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e soil, coco and hydroponics\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"hcs-specs\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eElements:\u003c\/strong\u003e Calcium and magnesium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest for:\u003c\/strong\u003e RO, rainwater and soft supplies\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTypical dose:\u003c\/strong\u003e 1 to 2 ml per litre\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with:\u003c\/strong\u003e Any base feed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e All\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cdiv class=\"hcs-dosing\" style=\"margin:32px 0 0;border:1px solid #e6e6e6;border-radius:12px;overflow:hidden;font-family:Montserrat,-apple-system,'Segoe UI',sans-serif;\"\u003e\n\u003cdiv style=\"background:#101010;padding:16px 20px;border-bottom:3px solid #efc04c;\"\u003e\n\u003cdiv style=\"color:#ffffff;font-size:17px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;\"\u003eFeed Chart\u003c\/div\u003e\n\u003cdiv style=\"margin-top:6px;color:#b8b8b8;font-size:12px;line-height:1.5;\"\u003eHesi CalMag · soil, coco and hydroponics\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;color:#2b2b2b;background:#fff;\"\u003e\n\u003ctr style=\"background:#f4f4f4;\"\u003e\n\u003cth style=\"text-align:left;padding:10px 20px;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#6b6b6b;font-weight:600;\"\u003eWater and lighting\u003c\/th\u003e\n\u003cth style=\"text-align:right;padding:10px 14px;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#6b6b6b;font-weight:600;white-space:nowrap;\"\u003ePer 1 L\u003c\/th\u003e\n\u003cth style=\"text-align:right;padding:10px 20px;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#6b6b6b;font-weight:600;white-space:nowrap;\"\u003ePer 10 L\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;\"\u003eRO, rainwater and soft supplies — into plain water before the base feed\u003c\/td\u003e\n\u003ctd style=\"padding:12px 14px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;font-weight:600;\"\u003e1 ml\u003c\/td\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;color:#6b6b6b;\"\u003e10 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fcfaf4;\"\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;\"\u003eHigh-intensity lighting — through peak flower, maximum\u003c\/td\u003e\n\u003ctd style=\"padding:12px 14px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;font-weight:600;\"\u003e2 ml\u003c\/td\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;color:#6b6b6b;\"\u003e20 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"background:#101010;padding:12px 20px;font-size:12px;color:#b8b8b8;line-height:1.6;\"\u003e\n\u003cspan style=\"color:#efc04c;font-weight:600;\"\u003eNote\u003c\/span\u003e — On hard water, test first — it is usually unnecessary. Never mix it alongside a concentrated phosphate feed. Check pH and EC after mixing.\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Hesi","offers":[{"title":"1 Litre","offer_id":53496887116042,"sku":"NUT-HES-014-01","price":14.49,"currency_code":"GBP","in_stock":true},{"title":"5 Litre","offer_id":53496887148810,"sku":"NUT-HES-014-02","price":52.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/Hesi_20Calmag_201L_20325x500_5c58580d-6f00-4ed9-b20f-2df3aba4c725.png?v=1786276470","url":"https:\/\/hydrocropshop.co.uk\/products\/hesi-calmag","provider":"Hydro Crop Shop","version":"1.0","type":"link"}