{"product_id":"gt-ph-control-up-down","title":"GT pH Up \u0026 pH Down | Precision pH Control for Maximum Nutrient Uptake","description":"\u003cp\u003e\u003cstrong\u003eGT pH Up \u0026amp; pH Down\u003c\/strong\u003e is a precision pH control system for hydroponic and soil growers who want their nutrients to actually work. pH is the single variable that determines whether the nutrients you're feeding are available to your plants — drift outside the 5.5–6.5 optimal range and deficiencies appear regardless of what's in your reservoir.\u003c\/p\u003e\n\u003cp\u003eGT pH Up (potassium hydroxide) and pH Down (phosphoric acid) give you fast, accurate control over your nutrient solution, with the added benefit of contributing potassium and phosphorus as secondary nutrients. Compatible with hydroponics, coco coir, and soil.\u003c\/p\u003e\n\u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMaintains the 5.5–6.5 pH range where nutrient uptake is most efficient\u003c\/li\u003e\n\u003cli\u003ePrevents nutrient lockout caused by pH drift in recirculating systems\u003c\/li\u003e\n\u003cli\u003epH Up (KOH) adds potassium as a beneficial secondary nutrient\u003c\/li\u003e\n\u003cli\u003epH Down (H₃PO₄) adds phosphorus and is stable across most nutrient programs\u003c\/li\u003e\n\u003cli\u003eProfessional-grade concentrations for precise, predictable adjustments\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003cp\u003epH controls whether your nutrients are available to your plants. When it drifts, even a well-mixed solution stops working. pH Up raises pH to bring an acidic solution back into range. pH Down lowers it when your water or nutrients push things too alkaline. In recirculating systems, pH shifts naturally over time as plants feed — so checking and adjusting regularly isn't extra work, it's just part of running a dialled-in system.\u003c\/p\u003e\n\u003ch2\u003eHow to Use\u003c\/h2\u003e\n\u003cp\u003eAlways adjust pH after adding nutrients and additives to your solution. Add small amounts gradually, mix thoroughly, and re-test before adjusting further. Monitor daily in recirculating systems. Allow solution to stabilise 30–60 minutes before making a final pH reading for accuracy.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cem\u003eSmall, frequent adjustments are more accurate than large corrections — overshoot in either direction and you'll be chasing pH all day.\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e⚠️ Safety \u0026amp; Handling\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003epH Up (Potassium Hydroxide):\u003c\/strong\u003e Highly alkaline and caustic. Always wear gloves and eye protection. Dilute before adding to tank. Store securely away from children. Safety Data Sheets available on request.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003epH Down (Phosphoric Acid 85%):\u003c\/strong\u003e Highly corrosive. Always wear gloves and eye protection. If skin or eye contact occurs, wash immediately with water. Dilute before adding to tank. Store securely away from children. Safety Data Sheets available on request.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003epH control is one of the highest ROI adjustments in any grow system. Get it right and everything else in your feed program performs better.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eHow often should I calibrate GT pH Up \u0026amp; pH Down?\u003c\/h3\u003e\n\u003cp\u003epH meters should be calibrated before every use or at minimum every 2–3 days during active grows. EC meters are more stable but should be verified against a known reference solution weekly. GT pH Up \u0026amp; pH Down uses two-point calibration for pH (4.0 and 7.0 buffer solutions) and single-point calibration for EC (2.77 mS\/cm standard). Regular calibration is the single most important factor in measurement accuracy.\u003c\/p\u003e\n\u003ch3\u003eHow do I store GT pH Up \u0026amp; pH Down properly?\u003c\/h3\u003e\n\u003cp\u003eAlways store pH probes wet — never allow the probe tip to dry out as this permanently damages the glass membrane. Use the probe storage solution supplied with GT pH Up \u0026amp; pH Down or Bluelab KCl storage solution. EC probes are more robust but should also be rinsed with clean water after each use. Store GT pH Up \u0026amp; pH Down at room temperature away from direct sunlight.\u003c\/p\u003e\n\u003ch3\u003eWhat should I do if GT pH Up \u0026amp; pH Down is reading incorrectly?\u003c\/h3\u003e\n\u003cp\u003eFirst, recalibrate using fresh buffer solutions — old or contaminated calibration fluid is the most common cause of inaccurate readings. Rinse the probe thoroughly with deionised or distilled water between calibrations. If readings are still inconsistent after recalibration, check the probe for physical damage or contamination. Most probes have a service life of 12–18 months with proper care.\u003c\/p\u003e\n\u003ch3\u003eIs GT pH Up \u0026amp; pH Down waterproof?\u003c\/h3\u003e\n\u003cp\u003eCheck the IP rating listed in the product specifications. Most handheld meters are splash-proof but not designed for submersion. Take care when measuring in deep reservoirs to avoid dropping the unit. GT pH Up \u0026amp; pH Down is designed for hydroponic nutrient solution testing — it is not rated for outdoor or continuous immersion use.\u003c\/p\u003e\n\u003ch3\u003eDoes GT pH Up \u0026amp; pH Down ship fast within Australia?\u003c\/h3\u003e\n\u003cp\u003eYes — GT pH Up \u0026amp; pH Down ships from our Australian warehouse with fast tracked delivery Australia-wide. Most east coast orders arrive within 2–5 business days. WA, NT, and TAS orders typically arrive within 5–12 business days.\u003c\/p\u003e","brand":"Growth Technology","offers":[{"title":"GT pH Down concentrate 250ml","offer_id":43147558682687,"sku":null,"price":14.95,"currency_code":"AUD","in_stock":true},{"title":"GT pH Down 1L","offer_id":43147558715455,"sku":null,"price":29.95,"currency_code":"AUD","in_stock":true},{"title":"GT pH Up concentrate 250ml","offer_id":43147558748223,"sku":null,"price":14.95,"currency_code":"AUD","in_stock":true},{"title":"GT pH Up concentrate 1L","offer_id":43147558780991,"sku":null,"price":24.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/6898\/8479\/files\/PHDOWN.jpg?v=1776773238","url":"https:\/\/apexgrow.com.au\/products\/gt-ph-control-up-down","provider":"Apex Grow","version":"1.0","type":"link"}