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IWS Flood and Drain PRO 25mm Remote Systems

In stock
SKU: 4640
Regular price £744.99

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Flood and Drain Hydroponic Grow Systems

Trap oxygen in the root zone and smash growth - it’s easy with 25mm IWS Flood & Drain System.

Plants are fed with a flood cycle.

To feed, plant pots are flooded with nutrients. When feeding ends, pots are quickly drained of feed. This locks oxygen in the rootzone, to drive nutrient uptake, fuel growth & prevent nasty root diseases.

  • Flood & Drain Growing System
  • 25mm (inner diameter) pipes – faster flood & drain, super precise feeding
  • Handy remote timer (1 minute segments)
  • 10 litre IWS Punched Pots
  • Flexible, modular layout – position pots how you want
  • Easy management – pots are filled from a single tank
  • Quiet – the pumps hardly ever on!
  • Save height: pots sit on the floor
  • Expandable up to 48 pots!
  • Low waste! Drained feed is stored for recirculation
  • Extreme oxygen – better roots, growth, nutrient uptake
  • Simple to set up and program

The 25mm pipes keep speed up the flood and drain process, for super accurate feeding. To make it even more precise, you get a 1-minute remote timer.

It’s easy to set and tweak your timer – remember, it’s remote. It’s not fixed to your system – you can keep it in a convenient spot (up to 2m from the control unit).

Your layout’s really flexible… position pots where you want – all pots are connected to a central feed tank individually or in groups.

Waste is low - drained feed is stored between floods. It'll run quietly too, the pump's hardly ever on!

Top Tips

1. Choosing your media

Use clay pebbles – they hold lots of air, but hardly any nutrients. They’re perfect for flood and drain.


To flood less often, mix 20 – 40% of coco with 60 – 80% of clay pebbles. The mix will hold more water, so you can flood less often. You can mix this yourself, or buy it pre-mixed.

2. Keeping a sterile system

Keep your system sterile with Silver Bullet Roots. It kills 99.99% of root diseases and stays active in tanks for 5 weeks!

If you already use Oxy-Plus 11.9%, switch to Silver Bullet and you’ll save 55%.

Layout Guides

How To Use

Assembling Your System

It’s easy to assemble your IWS Flood System. Watch this video to see how.

Prevent Root Blockages

Use the use the copper root control discs and rotate the inner pot by 45° in the same direction, every 2-3 days. This keeps growth even and stops roots growing in the feed pipe and get even growth.

For best results, place RhizoPots on the inside each pot to prevent root blockages. Air can penetrate the fabric layer and prune roots so they don’t grow down your feed pipe.

Choosing A Growing Media

Clay pebbles are perfect as they hold a lot of air but not much water.

Use them on their own – or mix 20 – 40% of coco with 60 – 80% of clay pebbles to flood less often.

Choosing Your Nutrients

Make sure you use a mineral feed - we recommend SHOGUN Hydro Nutrients.

Feed Time Guide for 60/40

  • Start: 2 x 15 minutes feeds per day
  • Veg: 3 x 15 minute feeds per day
  • Flowering: 4 - 5 x 15 minutes feeds per day

Feed Time Guide for pebbles:

  • Start: 2 x 15 minutes feeds per day
  • Veg: 3 - 4 x 15 minute feeds per day
  • Flowering: 4 - 6 x 15 minutes feeds per day

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Questions & Answers

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  • What size pots does this system come with, please?

    All our IWS Flood & Drain Pro Systems 25mm / Remote Timer setups come with 10 ltr pots.

  • Do the pots completely drain to avoid root rot?

    The pots that sit in the IWS Flood and Drain PRO 25mm Remote Systems will drain completely. The pots are located in raised channels and the system sits at a slight angle to help drainage to the exit reservoir. The lower exit reservoir channel may retain 1 or 2mm of runoff water but this has left the pots at that point.