{"product_id":"dosatron-hobby-expansion-doser","title":"Dosatron Hobby Expansion Doser – Fertiliser Injector Pump","description":"\u003ch2\u003eAdd Another Feed Line to Your Dosatron Hobby System\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eDosatron Hobby Expansion Doser\u003c\/strong\u003e is a single \u003cstrong\u003eD15RE05\u003c\/strong\u003e water-powered injector – the same unit used four times over in the \u003cstrong\u003eDosatron Hobby Cultivator\u003c\/strong\u003e – sold on its own so you can add another nutrient or additive line. The standard Hobby system runs four dosers; add expansion units to match any multi-part feed chart, \u003cstrong\u003eup to eight in total\u003c\/strong\u003e. It needs \u003cstrong\u003eno electricity\u003c\/strong\u003e: water pressure drives the piston, which draws concentrate at a set \u003cstrong\u003e0.5–5 ml per litre\u003c\/strong\u003e in direct proportion to the water flowing through it.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable 0.5–5 ml\/L\u003c\/strong\u003e (1:2000 to 1:200), set on the injection sleeve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProportional dosing\u003c\/strong\u003e – the dose follows the flow, so concentration holds from \u003cstrong\u003e1.9 to 18.9 L\/min\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater-powered\u003c\/strong\u003e, with no pumps, wiring or controllers to fail\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatches the Hobby system\u003c\/strong\u003e – the same 3\/4-inch connections, flow and pressure range as the four-pump base unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHandles most programmes\u003c\/strong\u003e: liquid and powder fertilisers, concentrated organics, enzymes and beneficial bacteria, pH up or down and line cleaning\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStack for strong concentrates\u003c\/strong\u003e – two dosers drawing from one stock reach rates above 5 ml\/L\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhen Your Feed Chart Outgrows Four Injectors\u003c\/h3\u003e\u003cp\u003eA base nutrient, a bloom booster, a silicate, a root stimulant and a pH adjuster is already five parts – one more than the standard Hobby system doses. Measuring the extra part by hand brings back the mixing errors and drifting \u003cstrong\u003enutrient ratios\u003c\/strong\u003e the injectors were bought to remove, and those show up in the plants as \u003cstrong\u003epoor nutrient uptake\u003c\/strong\u003e, deficiencies or lockout. An expansion doser keeps every part on the same automated, proportional dose.\u003c\/p\u003e\u003ch3\u003eHow to Use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrap every male thread\u003c\/strong\u003e with at least five turns of thread tape and join the doser to your system with a union – all unions facing the same way, and water following the flow arrow on the unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount it above the stock solution\u003c\/strong\u003e, never below, to prevent siphoning\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit the suction hose and weighted foot filter\u003c\/strong\u003e and lower it into the concentrate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrime:\u003c\/strong\u003e set the injection rate to maximum and run water until concentrate reaches the injection stem, then turn the water off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSet the rate:\u003c\/strong\u003e loosen the lock nut, turn the injection sleeve to your ml\/L figure and re-tighten\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAbove 5 ml\/L:\u003c\/strong\u003e run two dosers from the same stock, each set to \u003cstrong\u003ehalf\u003c\/strong\u003e the target rate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck EC and pH\u003c\/strong\u003e of the outgoing solution after every change\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\u003eFlow rate (L\/h):\u003c\/strong\u003e 100 – 1,000\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower (W):\u003c\/strong\u003e none (water-powered)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutlet (mm):\u003c\/strong\u003e 20x27 (3\/4\" M)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Dosatron Hobby single doser D15RE05 (part D15RE05VF)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDosing range:\u003c\/strong\u003e 0.5–5 ml\/L (0.05–0.5%, 1:2000 to 1:200)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating flow:\u003c\/strong\u003e 1.89–18.9 L\/min (0.5–5 US gal\/min)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConcentrate drawn:\u003c\/strong\u003e 0.06–5.7 L\/h\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating pressure:\u003c\/strong\u003e 2.5–6 bar (35–87 psi)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e 3\/4-inch inlet and outlet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax water temperature:\u003c\/strong\u003e 40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 160 x 133.5 x 345 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.15 kg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem limit:\u003c\/strong\u003e up to 8 dosers on one Hobby Cultivator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScale:\u003c\/strong\u003e home and hobby grows of about 4 to 24 lights; not for commercial cultivation (Dosatron)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintenance:\u003c\/strong\u003e annual seal service recommended\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;\"\u003eCan I use it on its own?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eYes. Each Hobby doser is a complete water-powered injector, so one unit can dose a single concentrate inline. Sold as an expansion unit, it is usually added to the four-pump Hobby Cultivator.\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 many dosers can one Hobby system run?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eUp to eight in total – the four in the base system plus up to four expansion units.\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;\"\u003eDo I need a mixing chamber?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eNo. Dosatron designed the Hobby pumps to blend properly without one, although a mixing chamber kit can be added.\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;\"\u003eWhat maintenance does it need?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eDosatron recommend an annual seal service to keep it dosing accurately.\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 suitable for a commercial site?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eDosatron rate the Hobby range for home and hobby grows – roughly 4 to 24 lights, or a dozen to a few hundred plants. Their professional Nutrient Delivery System range is built for commercial, all-day use.\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\u003ca href=\"\/products\/dosatron-4-part-hobby-cultivator-system-sysd15re05\" 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\/water-pump-dosatron-4-part-hobby-cultivator-system-sysd15re05-72436424737141.webp?v=1773260156\u0026amp;width=160\" alt=\"Dosatron 4-Part Hobby Cultivator 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;\"\u003eDosatron 4-Part Hobby Cultivator System\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eThe four-pump system this doser extends\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/div\u003e","brand":"Dosatron","offers":[{"title":"Default Title","offer_id":53929896444170,"sku":"HYD-ATHE-002-01","price":572.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/dosatron-hobby-expansion-doser-default-title-1.jpg?v=1792262364","url":"https:\/\/hydrocropshop.co.uk\/products\/dosatron-hobby-expansion-doser","provider":"Hydro Crop Shop","version":"1.0","type":"link"}