{"product_id":"iws-flood-drain-pots-and-outers","title":"IWS Flood \u0026 Drain Pots and Outers","description":"\u003csection class=\"gh-product-listing\"\u003e\n\n\u003ch2\u003eIWS Flood \u0026amp; Drain Pots and Outers (16 Litres) — Modular Hydroponics Components for Active Growing\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e Intermediate growers building or expanding a flood and drain hydroponics system where precision and proven yields matter\u003c\/p\u003e\n\n\u003cdiv class=\"gh-our-thoughts\" role=\"note\" aria-label=\"Our thoughts\"\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eOur thoughts\u003c\/strong\u003e\u003cbr\u003e\nThis is proper hydro kit from a manufacturer that's been doing this since 1976. The 16L size sits perfectly in the middle of the range — big enough to get real results, small enough to scale up without committing the earth. If you're moving beyond beginner systems and want a flood drain setup that actually delivers, IWS is the one growers pick.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eThe IWS Flood \u0026amp; Drain Pots and Outers (16 Litres) are component pots designed as part of Nutriculture's modular flood and drain hydroponics system. Each unit consists of an outer pot (which connects to your system's pipework) and an inner pot (which holds your substrate). When the system floods, nutrient solution rises from underneath to saturate the root zone, then drains back completely — cycling oxygen through the media and driving nutrient uptake. This is active hydroponics that works, and 16 litres is the sweet spot for growers who want serious yields without overcomplicating things.\u003c\/p\u003e\n\n\u003ch3\u003eHow it compares\u003c\/h3\u003e\n\u003cp\u003eThe IWS flood and drain system competes in the serious active hydroponics space.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs Wilma (drip irrigation)\u003c\/strong\u003e — Wilma feeds from the top down; IWS floods from the bottom up. IWS delivers more oxygen cycling and stronger root development, though Wilma is easier for absolute beginners\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs AutoPot (passive system)\u003c\/strong\u003e — AutoPot needs no electricity and is simpler to run, but grower feedback consistently shows IWS outperforms for yield and precision. Professional growers pick IWS every time\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs RAIN\/Alien flood systems\u003c\/strong\u003e — Both are flood and drain, but IWS operates at zero pressure, uses less electricity, and offers unlimited layout flexibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIn short: if yield and control matter more than simplicity, IWS is the choice.\u003c\/p\u003e\n\n\u003ch3\u003eUsage guidance\u003c\/h3\u003e\n\u003cp\u003eThe 16L pots work as part of a complete IWS system (6, 12, 18, 24, 36, or 48-pot configurations available).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSubstrate options\u003c\/strong\u003e\u003cbr\u003e\nThe inner pot accepts clay pebbles, coco coir, or a 60\/40 clay\/coco blend. If you're running coco, the sealed inner pot design prevents fragments blocking your system pipework.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSystem assembly\u003c\/strong\u003e\u003cbr\u003e\nEach outer pot connects via glands and fittings to your central pump and timer. The IWS Universal Pot Stand is essential — it positions your pots so the flood level hits exactly right and has built-in V-shaped drainage to return nutrient back to the reservoir.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFlood timing\u003c\/strong\u003e\u003cbr\u003e\nSet your timer in 1-minute increments. This precision is where IWS shines — you dial in your flood cycle (typically 15-30 minutes, 2-4 times daily depending on media type and ambient conditions) and let it run consistently. Consistency is the whole game with flood and drain.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe oxygen advantage\u003c\/strong\u003e\u003cbr\u003e\nWhen the solution drains, fresh air fills the root zone. When it floods, stale air gets pushed out. This constant cycling prevents root rot, locks in oxygen, and drives growth. It's why professional growers see better yields with flood drain than passive systems.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInner pot capacity: \u003cstrong\u003e16 litres of substrate\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eOuter pot dimensions: \u003cstrong\u003e280mm (height) x 280mm (diameter)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMaterial: \u003cstrong\u003eDurable plastic construction\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCompatible substrates: \u003cstrong\u003eClay pebbles, coco coir, or 60\/40 clay\/coco blend\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSystem integration: \u003cstrong\u003eConnects to IWS pipework via glands and fittings; part of modular 6, 12, 18, 24, 36, or 48-pot systems\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eEssential accessory: \u003cstrong\u003eIWS Universal Pot Stand (provides correct flood level and drainage)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eManufacturer: \u003cstrong\u003eNutriculture (IWS — Intelligent Watering Systems)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho this is for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIntermediate to advanced growers ready to move beyond beginner passive systems\u003c\/li\u003e\n\u003cli\u003eGrowers prioritising yield and precision control over simplicity\u003c\/li\u003e\n\u003cli\u003eSemi-commercial or professional operations running 12-36 plants where consistency matters\u003c\/li\u003e\n\u003cli\u003eOperators scaling up — starting with 12 pots and expanding later without replacing core infrastructure\u003c\/li\u003e\n\u003cli\u003eAnyone who's grown with Wilma or AutoPot and wants to see what a proper active system can do\u003c\/li\u003e\n\u003cli\u003eGrowers in tighter spaces who need to maximise output from limited footprint\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eOur take\u003c\/h3\u003e\n\u003cp\u003eThis is proper flood and drain kit from a manufacturer with 25+ years of proven form. The 16L size gives you enough substrate volume to get real results without the scale commitment of larger pots. Professional growers don't pick IWS by accident — they pick it because it outperforms everything else on yield, and the modular design means you can start small and expand as you go.\u003c\/p\u003e\n\u003cp\u003eIf you're building a serious growing setup and want a system that's repeatable, controllable down to the minute, and genuinely delivers the goods, this is worth picking up while stock lasts. Does exactly what it should, day in, day out.\u003c\/p\u003e\n\n\u003c\/section\u003e","brand":"IWS","offers":[{"title":"16 Litre Inner","offer_id":47916609732778,"sku":"89215","price":4.49,"currency_code":"GBP","in_stock":true},{"title":"16 Litre Outer","offer_id":47916609765546,"sku":"89214","price":5.49,"currency_code":"GBP","in_stock":true},{"title":"25 Litre Inner","offer_id":67874977022122,"sku":"89252","price":8.99,"currency_code":"GBP","in_stock":false},{"title":"25 Litre Outer","offer_id":67874977054890,"sku":"89251","price":8.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0053\/5540\/5400\/files\/89215_-_iws_16_litre_inner_pot_1_f86be32d-355f-44ed-89a2-664449cbd785.jpg?v=1769197103","url":"https:\/\/growershouse.co.uk\/products\/iws-flood-drain-pots-and-outers","provider":"Growers House ","version":"1.0","type":"link"}