IWS Control Units — Automated Flood & Drain Brain for Precise Hydroponic Management
Best for: Growers wanting to automate nutrient delivery with minute-level control across 6–48 pots without overcomplicating things
Our thoughts
The IWS brain is what separates a flood & drain system from actual automation. It does the heavy lifting — timing feeds, managing water return, oxygenating roots — while you get on with other things. Built in the UK by Nutriculture, it's been the go-to hydroponic controller for a decade because it just works.
The IWS Control Unit is the intelligent heart of an IWS flood & drain system. It's a dedicated hydroponic controller that automates water and nutrient delivery with precision timing, integrated float switches, and a reliable pump — letting you manage anything from a 6-pot starter setup to a 48-pot professional operation. No guessing. No manual watering. Just consistent, oxygenated root zones and time back in your day.
How it compares
This sits in the active automation bracket of hydroponic control systems.
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vs. AutoPot (gravity-fed): IWS offers minute-level timer precision and faster drain cycles; AutoPot is simpler but less flexible on timing
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vs. Drip systems: Lower maintenance, better oxygenation, fewer clogging issues; drip is more continuous but requires more tuning
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vs. Digital monitoring layers (Growee): IWS is a complete stand-alone solution; monitoring systems are add-ons to existing setups
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UK-made with integrated support — not reliant on third-party apps or sensors
Usage guidance
How the brain works
The control unit floods your pots at times you set (down to the minute). Two integrated magnetic float switches sense when the water level hits your target height and stop the flood automatically. When the cycle time finishes, the drain pump quietly returns nutrient solution back to the main reservoir, re-oxygenating it as it goes. This happens on a schedule you control.
Setting up
Installation is straightforward — under an hour if you follow instructions. The brain connects to your reservoir bucket (25 litres), pot manifolds, and the flood/drain lines. Timer is built into the Standard model; Pro models come with a remote timer for added flexibility.
Feeding schedules
Run flood cycles every 3–4 hours during lights-on. Adjust feed length based on pot size and growing medium — typically 15–20 minutes. The system scales from 6 to 48 pots, so one brain manages the whole operation.
Growing mediums
Works with clay pebbles, coco, soil, or mixed media. Choose your inner pot type accordingly (Aqua pot for pebbles, Culture pot for coco/soil, Punched pot for custom media).
Technical specifications
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Pump: Sicce Ultra Zero 3000 (triple flow rate for fast drain cycles)
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System capacity: Up to 48 pots per brain unit
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Float switches: 2 integrated magnetic switches for precise fill-level control
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Timer (Standard): 15-minute segmental timer built into brain
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Timer (Pro/Remote): Remote timer with 15-minute segmental and precise minute timer
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Pipe fittings: Standard 16mm or Pro 25mm (25mm suits larger setups)
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Reservoir: 25-litre control bucket (gravity-fed to pots, pumps handle fill/drain only)
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Manifacturer: Nutriculture, UK-made
Who this is for
- Growers stepping up from hand-watering to automation without complexity
- Mid-to-professional operators running 12–48 pot setups
- Anyone wanting precise feed timing and better oxygenation than passive systems
- Growers using clay pebbles or inert media (where flood & drain excels)
- Those who prefer UK-made kit with direct manufacturer support
Our take
This is a hydroponic controller that actually saves you work. It automates the fiddly bits — timing, water return, oxygenation — while staying simple enough that you're not troubleshooting app crashes at 2am. The float switches prevent overwatering, the pump is powerful enough for the job, and the build quality is solid.
If you're running flood & drain and want to move beyond manual cycles, the IWS brain is worth picking up. One we sell a lot of for growers ready to scale properly.
