IWS Flood & Drain Systems

iws flood & drain system

Up to 80 plants can be managed from one timer and one water butt, with the IWS Flood and Drain – The most popular modular hydroponic system.

The famous IWS system in my opinion is the best active system around, the Pro is awesome!



How IWS Flood and Drain hydroponic systems work.

At the set times solution is pumped from the water butt into each pot allowing the plants to feed and pushing out air. Floats ensure the same level of solution rises into every pot.

When the solution drains from the pots fresh air is pulled into the root zone. The drained solution is pumped back to the water butt, re-balancing the pH and EC.

Because stale air is replaced with fresh oxygen-rich air at every feed the roots are well oxygenated which drives more productive growth.

Drainage is excellent with this grow system, so it is important to remember to increase the amount of feeds as the plants grow.

Pot StandsCopper Disc InsertsRemote Timer
Flood & Drain StdNoNoNo
Flood & Drain ProYesYesYes
Flood & Drain RemoteYesYesYes

why they are great

Perfect for growers who want to:

  1. Choose how to space pots
  2. Benefit from the oxygen-rich nature of pebbles
  3. Finely tune feeds
  4. Grow on a larger scale or add pots at a later date
  5. Manage one water butt for many plants

hints and tips

Feed Guide for 60/40Feed Guide for Pebbles
Start2 x 15 minute feeds per day2 x 15 minute feeds per day
Veg3 x 15 minute feeds per day3-4 x 15 minute feeds per day
Flowering4-5 x 15 minute feeds per day4-6 x 15 minute feeds per day

As with all methods of growing increase or decrease feeds according to plant requirements.

Check out our guide to planting out in a IWS Flood & Drain system.