{"product_id":"iws-flexi-tank-without-pipes-pump","title":"IWS FlexiTank Without Pipes \u0026 Pump","description":"```html\n\u003csection class=\"gh-product-listing\"\u003e\n\n\u003ch2\u003eIWS FlexiTank Without Pipes \u0026amp; Pump — Flexible Hydroponic Reservoir for Flood \u0026amp; Drain Systems\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e Growers running IWS flood and drain systems who want a reliable, space-saving reservoir without the pump and pipework\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\nIWS FlexiTanks have been tested to destruction and never faltered. If you're already committed to flood and drain growing, this is proper kit — built to work with IWS brains, designed to pack away flat, and made to last. One growers trust for good reason.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eThe IWS FlexiTank Without Pipes \u0026amp; Pump is a \u003cstrong\u003estandalone flexible fabric reservoir\u003c\/strong\u003e designed as the nutrient storage backbone of IWS flood and drain hydroponic systems. Unlike rigid plastic tanks, it collapses flat for storage, sets up in minutes, and gives you full control over your ebb and flow cycle without the usual space compromise.\u003c\/p\u003e\n\n\u003cp\u003eThis is the tank-only version — you supply your own pump and pipework, or integrate it into an existing IWS system. It comes with all the fittings you need to connect to IWS brains and compatible 13mm and 25mm pipework.\u003c\/p\u003e\n\n\u003ch3\u003eHow flood and drain systems work\u003c\/h3\u003e\n\n\u003cp\u003eEbb and flow hydroponics flood your growing medium with nutrient solution, then drain it back into the reservoir. This cycle forces fresh air into the root zone while nutrients circulate — your plants get oxygen, water, and food all at once. The result: faster growth, reduced nutrient waste (growers typically save 10-30% on fertiliser), and plants that thrive on simplicity.\u003c\/p\u003e\n\n\u003cp\u003eThe FlexiTank is where all that drained solution goes, ready to be pumped back up for the next flood cycle.\u003c\/p\u003e\n\n\u003ch3\u003eHow it compares\u003c\/h3\u003e\n\n\u003cp\u003eFlexiTanks sit between budget DIY solutions and premium rigid plastic reservoirs.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. rigid plastic tanks:\u003c\/strong\u003e Same durability and capacity, but collapses flat and costs less. No storage nightmare\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. gravity-fed systems (AutoPot):\u003c\/strong\u003e Flood and drain gives you more control and faster growth rates, though it does need a pump and timer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. generic fabric tanks:\u003c\/strong\u003e IWS FlexiTanks are purpose-built for IWS brains with reinforced fittings, proper leg support, and proven reliability in UK grow rooms\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eIf you want a proper flood and drain setup without buying a rigid tank you can't shift, this is where you land.\u003c\/p\u003e\n\n\u003ch3\u003eUsage guidance\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eSetup and assembly\u003c\/strong\u003e\u003cbr\u003eUnroll the tank, slide the five support legs into the vertical slots on the fabric, and fit your irrigation fittings into the reinforced holes. You're ready to connect pipework and pump within minutes. It packs down just as fast.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eTank capacity and grow room size\u003c\/strong\u003e\u003cbr\u003eAvailable in 50L, 100L, 225L, 400L, and 750L sizes. Choose based on your number of pots and flood cycles — bigger tanks mean less frequent top-ups and more stable nutrient strength. For small setups (under 10 pots), 100L covers it. Larger rooms scale up.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFlood cycle management\u003c\/strong\u003e\u003cbr\u003eThe tank works with IWS control brains (basic, standard, or pro models). The Pro uses a single 4000lph drain pump, so the FlexiTank comes with one drain hole. Set your flood times on the brain, keep nutrient levels topped up, and check EC and pH weekly. The recirculating nature means your solution stays stable.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eLight proofing\u003c\/strong\u003e\u003cbr\u003eThe zippered lid is 100% light proof, preventing algae growth in your reservoir. Algae kills oxygen levels and destabilises your nutrient mix — this lid solves that problem outright.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePipework compatibility\u003c\/strong\u003e\u003cbr\u003eConnect using 13mm or 25mm flexi pipe depending on your IWS brain variant. All holes are reinforced to handle pressure without splitting.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable sizes:\u003c\/strong\u003e 50L, 100L, 225L, 400L, 750L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50L dimensions (assembled):\u003c\/strong\u003e 35cm diameter × 53cm height\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100L dimensions (assembled):\u003c\/strong\u003e 43cm diameter × 78cm height\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e225L dimensions (assembled):\u003c\/strong\u003e 63.5cm diameter × 81cm height\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e400L dimensions (assembled):\u003c\/strong\u003e 68cm diameter × 111cm height\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Thick, waterproof flexible fabric with reinforced pipe\/tap holes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupport structure:\u003c\/strong\u003e Five fabric-slotted support legs for vertical stability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLid:\u003c\/strong\u003e Full-length zip closure, 100% light proof\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrain configuration:\u003c\/strong\u003e One drain hole (compatible with IWS Pro Remote Brain 4000lph pump)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe compatibility:\u003c\/strong\u003e 13mm and 25mm flexi pipe fittings included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFolded storage:\u003c\/strong\u003e Packs flat like a tent for easy transportation and storage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho this is for\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eGrowers already committed to IWS flood and drain systems looking to upgrade or replace their reservoir\u003c\/li\u003e\n\u003cli\u003eLoft and small-space growers who can't justify rigid tanks they can't store\u003c\/li\u003e\n\u003cli\u003eAnyone scaling their ebb and flow setup and needing extra capacity without permanent fixture costs\u003c\/li\u003e\n\u003cli\u003eGrowers prioritising reliability and UK-made quality over budget plastic alternatives\u003c\/li\u003e\n\u003cli\u003eExperienced flood and drain users who know what they want from a reservoir and don't need hand-holding\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eNot ideal if you're starting hydro from scratch and don't already own an IWS brain — you'll need the pump and control unit separately. But if you're already in the IWS ecosystem, this is a no-brainer.\u003c\/p\u003e\n\n\u003ch3\u003eOur take\u003c\/h3\u003e\n\n\u003cp\u003eThis is a properly engineered bit of kit. IWS have been refining flood and drain for years, and the FlexiTank design reflects that — it's tough, it works, and it doesn't pretend to be anything other than what it is.\u003c\/p\u003e\n\n\u003cp\u003eIf you're running IWS flood and drain and need to add tank capacity or replace a rigid reservoir, worth picking up while stock lasts. Does exactly what it should, and it'll outlast most of the other stuff in your grow room.\u003c\/p\u003e\n\n\u003c\/section\u003e\n```","brand":"IWS","offers":[{"title":"100 litre","offer_id":47916589973674,"sku":"127030","price":47.99,"currency_code":"GBP","in_stock":true},{"title":"225 litre","offer_id":47916590006442,"sku":"127040","price":68.99,"currency_code":"GBP","in_stock":true},{"title":"750 Litre","offer_id":47916590039210,"sku":"127055","price":249.99,"currency_code":"GBP","in_stock":false},{"title":"400 litre","offer_id":47916590071978,"sku":"127050","price":124.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0053\/5540\/5400\/files\/127040_250_litre_3_6df967de-4cfb-4c86-b452-6e1d7ec552d1.jpg?v=1769196747","url":"https:\/\/growershouse.co.uk\/products\/iws-flexi-tank-without-pipes-pump","provider":"Growers House ","version":"1.0","type":"link"}