{"product_id":"iws-flood-and-drain-standard-16mm","title":"IWS Flood and Drain Standard 16mm – Hydroponic Grow System","description":"\u003ch2\u003eHands-Off Flood and Drain Feeding From One Tank\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eIWS Flood and Drain Standard 16mm\u003c\/strong\u003e is the entry point to IWS's modular recirculating system and has been a grow room favourite for over a decade. A central \u003cstrong\u003econtrol unit\u003c\/strong\u003e, known as the brain, sits among the pots and is joined to each one by \u003cstrong\u003e16mm pipework\u003c\/strong\u003e. At every feed time set on its built-in \u003cstrong\u003e15-minute segmental timer\u003c\/strong\u003e, solution is pumped from the \u003cstrong\u003eIWS FlexiTank\u003c\/strong\u003e into the brain and the pots fill with it until a float in the brain shuts the flow off level with the top of the pots, so the system cannot overflow. When the feed ends, the solution drains back to the tank to be used again. Flooding pushes stale air out of the root zone and draining pulls fresh air back in, which keeps roots oxygenated, drives \u003cstrong\u003enutrient uptake\u003c\/strong\u003e and avoids the slow growth and root problems of a medium that stays waterlogged. Every pot drinks from the same tank, so pH, EC and temperature are checked in one place, and kits run from \u003cstrong\u003e6 to 48 pots\u003c\/strong\u003e.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIWS Standard control unit (brain)\u003c\/strong\u003e with integrated 15-minute segmental timer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIWS 10 litre outer pots\u003c\/strong\u003e, one per plant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIWS 9.5 litre punched inner pots\u003c\/strong\u003e, one per plant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIWS FlexiTank\u003c\/strong\u003e sized to the kit, with its tank pump and fill and drain pipework\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16mm pipe and fittings\u003c\/strong\u003e, with the glands that seal each pot connection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic flood height\u003c\/strong\u003e: the brain's float stops the feed level with the top of the pots, so they never overflow\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFresh air at every cycle\u003c\/strong\u003e: each flood and drain replaces stale air in the root zone\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne tank for every pot\u003c\/strong\u003e: drained feed returns to the FlexiTank, so there is little waste and only one solution to manage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTimer built into the brain\u003c\/strong\u003e: 15-minute segments set the feed times without a separate controller\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModular, floor-level layout\u003c\/strong\u003e: add, remove or move pots at any time, and save headroom\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCollapsible FlexiTank\u003c\/strong\u003e that packs flat between grows\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eHow to Use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eStand the brain and all the pots on the \u003cstrong\u003esame level floor\u003c\/strong\u003e - the brain's float height matches the top of the pots\u003c\/li\u003e\n\u003cli\u003eConnect each outer pot to the brain with the \u003cstrong\u003e16mm pipe and fittings\u003c\/strong\u003e, then set up the FlexiTank and its pump\u003c\/li\u003e\n\u003cli\u003eFill the punched inner pots with \u003cstrong\u003eclay pebbles\u003c\/strong\u003e, or about \u003cstrong\u003e60-80% clay pebbles with 20-40% coco\u003c\/strong\u003e if you would rather flood less often\u003c\/li\u003e\n\u003cli\u003eSet the feed times on the brain's \u003cstrong\u003e15-minute segmental timer\u003c\/strong\u003e, starting with short, regular floods and adjusting as the plants and medium dictate\u003c\/li\u003e\n\u003cli\u003eCheck \u003cstrong\u003epH and EC\u003c\/strong\u003e in the tank at each top-up; IWS say the system can run for weeks before the tank needs a full change\u003c\/li\u003e\n\u003cli\u003eFlush the pots and pipework with clean water between crops\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePallet Delivery\u003c\/h3\u003e\u003cp\u003eThis is a large system and ships \u003cstrong\u003eon a pallet\u003c\/strong\u003e. A \u003cstrong\u003e£40.00 pallet delivery surcharge\u003c\/strong\u003e applies to UK mainland orders, and \u003cstrong\u003e£49.95\u003c\/strong\u003e to Northern Ireland. The surcharge is added at checkout, and free delivery over £60 does not apply to pallet items.\u003c\/p\u003e\u003cdiv class=\"hcs-specs\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e IWS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem type:\u003c\/strong\u003e Recirculating flood and drain (ebb and flow), Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl:\u003c\/strong\u003e IWS Standard control unit (brain), integrated 15-minute segmental timer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipework:\u003c\/strong\u003e 16mm (13mm internal diameter)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter pots:\u003c\/strong\u003e 10 litre\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner pots:\u003c\/strong\u003e 9.5 litre punched pots (6.5 litre Aqua and Culture inner pots sold separately)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6 pot:\u003c\/strong\u003e 100L FlexiTank\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12, 18 and 24 pot:\u003c\/strong\u003e 250L FlexiTank\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e36 and 48 pot:\u003c\/strong\u003e 400L FlexiTank\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexiTank size, assembled:\u003c\/strong\u003e 100L 43cm diameter x 78cm high; 400L 68cm diameter x 111cm high\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank pump:\u003c\/strong\u003e IWS MJ1000 long-lead assembly, 1,000 L\/h\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended for:\u003c\/strong\u003e 6 to 24 pots (IWS); kits run to 48 pots\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable media:\u003c\/strong\u003e Clay pebbles, or clay pebbles mixed with coco\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot included:\u003c\/strong\u003e Pot stands and copper discs (supplied with the Standard Remote and Pro Remote)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDelivery:\u003c\/strong\u003e Ships on a pallet, £40.00 surcharge applies\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;\"\u003eWhat is the difference between the Standard and the Standard Remote?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eBoth run on 16mm pipework with the same pots and FlexiTank. The Standard has a 15-minute segmental timer built into the brain. The Standard Remote adds a separate minute timer that sets each flood from 1 to 60 minutes and can be mounted outside the grow room, and it comes with pot stands and copper discs.\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;\"\u003eWhich growing medium works best?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eClay pebbles are the usual choice for flood and drain because they hold plenty of air and little water. Mixing in 20-40% coco makes the medium hold more water, so the pots need flooding less often.\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;\"\u003eCan I add pots later?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eYes. The system is modular, and extra outer pots, inner pots and fittings are sold separately. Keep the tank in proportion: IWS supply 100L for 6 pots, 250L for up to 24 and 400L for 36 to 48.\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;\"\u003eWhen should I choose the Pro Remote instead?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eIWS recommend the Standard for 6 to 24 pots. For bigger rooms, or if you want the pots to fill and drain faster, the Pro Remote uses 25mm pipework and a 3,000 L\/h pump.\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\/iws-control-units\" 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\/iws-control-units.jpg?v=1787262443\u0026amp;width=160\" alt=\"IWS Control Units\" 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;\"\u003eIWS Control Units\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eSpare brains and remote timers\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/iws-flood-drain-pots-stands-and-outers\" 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\/iws-flood-drain-pots-stands-and-outers-1.png?v=1785337971\u0026amp;width=160\" alt=\"IWS Flood \u0026amp; Drain Pots, Stands and Outer Containers\" 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;\"\u003eIWS Flood \u0026amp; Drain Pots, Stands and Outer Containers\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eExtra pots and stands to expand\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/iws-copper-discs\" 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\/89270_-_170mm_Copper_Disc.jpg?v=1785322281\u0026amp;width=160\" alt=\"IWS Copper Discs\" 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;\"\u003eIWS Copper Discs\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eCopper root control discs\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/canna-aqua-clay-pebbles-45l\" 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\/grow-media-canna-aqua-clay-pebbles-45l-29882528334008.webp?v=1783879284\u0026amp;width=160\" alt=\"Canna Aqua Clay Pebbles 45L\" 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;\"\u003eCanna Aqua Clay Pebbles 45L\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eClay pebbles for flood and drain\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/div\u003e","brand":"IWS","offers":[{"title":"6 Pot - 100L FlexiTank","offer_id":53929951265034,"sku":"HYD-IWWS-004-01","price":388.95,"currency_code":"GBP","in_stock":true},{"title":"12 Pot - 250L FlexiTank","offer_id":53929951297802,"sku":"HYD-IWWS-004-02","price":478.99,"currency_code":"GBP","in_stock":true},{"title":"18 Pot - 250L FlexiTank","offer_id":53929951330570,"sku":"HYD-IWWS-004-03","price":572.99,"currency_code":"GBP","in_stock":true},{"title":"24 Pot - 250L FlexiTank","offer_id":53929951363338,"sku":"HYD-IWWS-004-04","price":657.99,"currency_code":"GBP","in_stock":true},{"title":"36 Pot - 400L FlexiTank","offer_id":53929951396106,"sku":"HYD-IWWS-004-05","price":757.99,"currency_code":"GBP","in_stock":true},{"title":"48 Pot - 400L FlexiTank","offer_id":53929951428874,"sku":"HYD-IWWS-004-06","price":937.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/iws-flood-and-drain-standard-16mm-6-pot-100l-flexitank-1.jpg?v=1792263015","url":"https:\/\/hydrocropshop.co.uk\/products\/iws-flood-and-drain-standard-16mm","provider":"Hydro Crop Shop","version":"1.0","type":"link"}