{"product_id":"emerald-harvest-ph-down","title":"Emerald Harvest pH Down – Phosphoric Acid for Hydroponics","description":"\u003ch2\u003eBring a High-pH Feed Back Into the Sweet Spot\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eEmerald Harvest pH Down\u003c\/strong\u003e is a premium \u003cstrong\u003epH acidifier\u003c\/strong\u003e based on \u003cstrong\u003ephosphoric acid (40–45%)\u003c\/strong\u003e, made to lower the pH of a nutrient solution or growing medium that has drifted too alkaline. Emerald Harvest formulates it as a buffer around a weak acid, so small additions bring a reservoir into the maker's recommended \u003cstrong\u003epH 5.5–6.3\u003c\/strong\u003e range without a sudden swing that stresses roots or the beneficial microbes in the root zone. It is made for \u003cstrong\u003ehydroponic systems\u003c\/strong\u003e, works in any growing medium where the pH reads too high, and pairs with Emerald Harvest pH Up for corrections in either direction.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhosphoric acid base\u003c\/strong\u003e – a \u003cstrong\u003e40–45%\u003c\/strong\u003e phosphoric acid solution that lowers pH quickly and predictably.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGentle on roots and microbes\u003c\/strong\u003e – a weak-acid buffer, used in small quantities, that avoids sudden swings and keeps beneficial bacteria colonies stable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrevents nutrient lockout\u003c\/strong\u003e – holding pH in range keeps iron, manganese and the other essential elements available.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConcentrated\u003c\/strong\u003e – a little moves a full reservoir, so it goes a long way.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong shelf life\u003c\/strong\u003e – \u003cstrong\u003e3 years or more\u003c\/strong\u003e under normal storage.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eNutrient Lockout From a High pH\u003c\/h3\u003e\u003cp\u003eWhen a nutrient solution or growing medium drifts above about \u003cstrong\u003epH 6.5\u003c\/strong\u003e, some elements, iron and manganese in particular, become partly or wholly locked out. Leaves can yellow, spot, curl or die back and growth slows even though the feed is right on paper, and stressed plants are more open to pests and disease. Those symptoms have other causes too, so test first; if the pH reads high, a small dose of pH Down restores the balance and nutrient uptake gets back on track.\u003c\/p\u003e\u003ch3\u003eHow to Use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMix first:\u003c\/strong\u003e add every base nutrient and additive to the water and stir before measuring the pH with a calibrated meter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDose in small steps:\u003c\/strong\u003e add a very small amount of pH Down, stir thoroughly and re-test after each addition.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTarget:\u003c\/strong\u003e \u003cstrong\u003epH 5.5–6.3\u003c\/strong\u003e for the nutrient solution and growing medium, with \u003cstrong\u003e5.8–6.3\u003c\/strong\u003e as Emerald Harvest's sweet spot for hydroponic gardens.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoil and coco:\u003c\/strong\u003e correct the pH of the feed solution before watering, as part of your usual routine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNever mix it neat\u003c\/strong\u003e with pH Up or concentrated nutrients; always add it to the diluted solution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety:\u003c\/strong\u003e it is corrosive – wear gloves and eye protection, keep it in its original container, sealed, locked away, in a cool, dry place out of direct sunlight.\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\u003eBrand:\u003c\/strong\u003e Emerald Harvest\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e pH Down – premium pH acidifier\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActive ingredient:\u003c\/strong\u003e Phosphoric acid, 40–45%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct pH:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAppearance:\u003c\/strong\u003e Clear, odourless liquid\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDensity:\u003c\/strong\u003e 1.32 kg\/L at 20°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTarget range:\u003c\/strong\u003e pH 5.5–6.3; sweet spot 5.8–6.3 for hydroponics\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable for:\u003c\/strong\u003e Hydroponic systems and any growing medium where the pH is too high\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShelf life:\u003c\/strong\u003e 3 years or more under normal storage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHazards:\u003c\/strong\u003e Causes severe skin burns and eye damage; may be corrosive to metals\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cdiv class=\"hcs-faq\"\u003e\n\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eHow much pH Down should I add?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eThere is no fixed dose, because it depends on your water and the nutrients in it. Add a very small amount, stir well and re-test, repeating until the solution reaches pH 5.5–6.3.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eCan I use it with soil and coco as well as hydro?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eYes. Adjust the pH of the feed solution before you water, as you would for a hydroponic reservoir.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eDoes it work with other nutrient brands?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eYes. It lowers the pH of any nutrient solution. Emerald Harvest base nutrients are pH buffered, so with their range you will usually need less.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eIs it safe to handle?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eIt is a corrosive acid, so wear gloves and eye protection, avoid splashes and store it sealed in its original container, locked away from children.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e\u003ch3\u003eWorks Well With\u003c\/h3\u003e\u003cdiv class=\"hcs-related\" style=\"display:flex;flex-wrap:wrap;gap:10px;margin:12px 0 0;\"\u003e\n\u003ca href=\"\/products\/emerald-harvest-ph-up-0-95-litre\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/emerald-harvest-ph-up-0-95-litre-1.jpg?v=1785337922\u0026amp;width=160\" alt=\"Emerald Harvest pH Up\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eEmerald Harvest pH Up\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eRaises the pH when a solution tests too acidic\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/bluelab-ph-pen\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/bluelab-PH-pen-2-medium_landscape.jpg?v=1746904767\u0026amp;width=160\" alt=\"Bluelab pH Pen\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eBluelab pH Pen\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eMeasure the pH before and after each addition\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/emerald-harvest-3-part-set-grow-bloom-micro\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/emerald-harvest-3-part-set-grow-bloom-micro-3-79-litre.png?v=1787265256\u0026amp;width=160\" alt=\"Emerald Harvest 3 Part Set\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eEmerald Harvest 3 Part Set\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eThe pH-buffered base nutrients it is made to partner\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/div\u003e","brand":"Emerald Harvest","offers":[{"title":"3.79 Litre","offer_id":53929890939146,"sku":"NUT-EMER-005-01","price":58.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/emerald-harvest-ph-down-3-79-litre-1.jpg?v=1792261712","url":"https:\/\/hydrocropshop.co.uk\/products\/emerald-harvest-ph-down","provider":"Hydro Crop Shop","version":"1.0","type":"link"}