{"product_id":"growmax-3000-500-gpd-ro-membrane","title":"GrowMax 3000 500 GPD RO Membrane – High Flow Replacement","description":"\u003ch2\u003eBring your GrowMax 3000 back to full flow and rejection\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eGrowMax 3000 500 GPD RO Membrane\u003c\/strong\u003e is the genuine high-flow replacement membrane for the \u003cstrong\u003eGrowMax 3000 Reverse Osmosis System\u003c\/strong\u003e, GrowMax's largest RO unit. The 3000 runs \u003cstrong\u003etwo of these membranes in parallel\u003c\/strong\u003e to produce up to \u003cstrong\u003e125 litres an hour and 3,000 litres a day\u003c\/strong\u003e of purified water, and the membrane is the stage that does the real work, removing \u003cstrong\u003eup to 95% of dissolved salts and heavy metals\u003c\/strong\u003e so every feed you mix starts from a clean, low-EC base rather than whatever came out of the mains.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine GrowMax part\u003c\/strong\u003e – maker reference GMWMAXMEMB, made for the GrowMax 3000 housing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500 GPD high-flow rating\u003c\/strong\u003e – two side by side give the 3000 its \u003cstrong\u003e3,000 litres a day\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 95% rejection\u003c\/strong\u003e of salts and heavy metals for a low, predictable starting EC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRestores output\u003c\/strong\u003e when a worn membrane has slowed production\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrings EC back down\u003c\/strong\u003e when an ageing membrane starts letting dissolved solids through\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhy Does My RO Water Keep Creeping Up in EC?\u003c\/h3\u003e\u003cp\u003eAn RO membrane is a consumable. As it loads up, production slows and more dissolved solids slip past it, so the water you treat as pure quietly picks up EC again. On hard UK mains that returning calcium and magnesium eats into your nutrient headroom, skews feed ratios and shows up as pH drift, lockout and poor nutrient uptake that no amount of feed adjustment fixes. GrowMax's own rule is simple: change the membrane when the output EC rises or the water production drops.\u003c\/p\u003e\u003ch3\u003eHow to Use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eTurn off the supply and release the pressure before opening the membrane housing.\u003c\/li\u003e\n\u003cli\u003eRemove the old membrane and fit the new one the same way round, then close the housing.\u003c\/li\u003e\n\u003cli\u003eLet the unit run to waste for \u003cstrong\u003e15 minutes\u003c\/strong\u003e after fitting a new membrane, as GrowMax instruct, before collecting water for use.\u003c\/li\u003e\n\u003cli\u003eChange the membranes every \u003cstrong\u003e6 months to 2 years\u003c\/strong\u003e depending on use and input EC, and the \u003cstrong\u003egreen carbon block every 6 months\u003c\/strong\u003e – chlorine that gets past a spent carbon block shortens membrane life.\u003c\/li\u003e\n\u003cli\u003eKeep the GrowMax 3000 on a \u003cstrong\u003ecold supply of 4–6 bar (57–85 PSI)\u003c\/strong\u003e, maximum 25°C.\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 high-flow reverse osmosis membrane\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRating:\u003c\/strong\u003e 500 GPD (US gallons per day)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GrowMax 3000 Reverse Osmosis System (takes two, running in parallel)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrowMax 3000 output:\u003c\/strong\u003e up to 125 L\/h, 3,000 L\/day with both membranes fitted\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRejection:\u003c\/strong\u003e up to 95% of salts and heavy metals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChange interval:\u003c\/strong\u003e 6 months to 2 years, depending on use and input EC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply (GrowMax 3000):\u003c\/strong\u003e 4–6 bar (57–85 PSI), cold only, max 25°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaker reference:\u003c\/strong\u003e GMWMAXMEMB\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;\"\u003eDo I need one membrane or two?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eThe GrowMax 3000 runs two 500 GPD membranes side by side, and this listing is a single membrane – order two to replace both.\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;\"\u003eWill it fit the Power Grow 500, Mega Grow 1000 or Maxquarium?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eNo. Those units take GrowMax's smaller 150 GPD membrane. This 500 GPD membrane is made for the GrowMax 3000 housing.\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;\"\u003eHow do I know when the membrane needs changing?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eCheck the EC of the water coming out of the unit. When it starts to climb, or the unit takes noticeably longer to fill your tank, the membrane is wearing out – typically somewhere between 6 months and 2 years depending on how hard your water is and how much you run it.\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;\"\u003eWill it take my water to 0 ppm?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eRO removes up to 95% of dissolved solids, so on hard water expect a low reading rather than zero. For true 0 ppm, growers add a de-ionisation stage after the RO.\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\/growmax-3000-reverse-osmosis-system\" 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\/growmax-3000-reverse-osmosis-system-1.jpg?v=1790163975\u0026amp;width=160\" alt=\"GrowMax 3000 Reverse Osmosis System\" 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;\"\u003eGrowMax 3000 Reverse Osmosis System\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eThe RO unit this membrane is made for\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/growmax-3000-green-carbon-block-filter\" 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\/growmax-3000-green-carbon-block-filter-1.jpg?v=1790163973\u0026amp;width=160\" alt=\"GrowMax 3000 Green Carbon Block Filter\" 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;\"\u003eGrowMax 3000 Green Carbon Block Filter\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003ePre-filter that protects the membranes, change every 6 months\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/div\u003e","brand":"GrowMax","offers":[{"title":"Default Title","offer_id":53929940746506,"sku":"NUT-GRO3-019-01","price":238.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/growmax-3000-500-gpd-ro-membrane-default-title-1.jpg?v=1792262962","url":"https:\/\/hydrocropshop.co.uk\/products\/growmax-3000-500-gpd-ro-membrane","provider":"Hydro Crop Shop","version":"1.0","type":"link"}