IWS Flexi-Pipe — Food-Grade Hydroponic Irrigation Tubing (13mm Standard & 25mm Pro)
Best for: IWS system owners needing replacement or extension pipe, and DIY growers building hydroponic setups with compatible fittings
Our thoughts
This is proper food-grade tubing that does exactly what it should in a hydroponic setup. Easy to cut, flexible around tight spots, and compatible with IWS systems right out of the box. One we sell a lot of for both replacements and system expansion.
IWS Flexi-Pipe is flexible irrigation tubing designed to connect your nutrient distribution tank to individual containers and link containers together in hydroponic systems. Available in two sizes — 13mm Standard for smaller setups and 25mm Pro for larger systems — it's made from food-grade plastic that handles nutrient solutions without degrading. Cut it to length, fit it to your connectors, and it handles nutrient distribution reliably day in, day out.
How it compares
This sits firmly in the system-native, mid-premium tier of hydroponic tubing.
- Original equipment specification for IWS systems — guaranteed compatibility with IWS Pro and Trident setups
- Food-grade plastic ensures safety with nutrient solutions
- Black opaque material prevents algae growth inside the pipe
- Significantly more reliable than generic budget tubing at £1.99/metre
- More flexible and easier to route than rigid PVC alternatives
In plain terms: you're getting proven hydroponic tubing that works with your system, not a gamble with generic plastic.
Usage guidance
System connection
Run from your brain-pot (central controller) to outer pots, and connect outer-pots to outer-pots for nutrient distribution. Easy to cut with sharp scissors or pipe cutters to the exact length you need.
Installation in tight spaces
The flex in the pipe means you can route it around obstacles, under shelving, or through crowded grow spaces without kinking or binding. Soften the pipe ends in hot water to make fitting connectors simpler — no wrestling required.
System expansion
Adding more plants to an existing setup? Flexi-pipe lets you extend your distribution network without replacing the whole system. Particularly useful with 25mm Pro when scaling up larger AutoDrain or Run to Waste setups.
Maintenance
Root blockage is common in high-performance systems — roots try to escape down the pipework. If you notice slower nutrient flow, flush the line or consider IWS Copper Root Control Inserts to prevent it happening again.
Technical specifications
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13mm Standard: 13mm internal diameter, available per metre (up to 15m) or as 15 metre rolls
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25mm Pro: 25mm internal diameter, available per metre or as 30 metre rolls
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Material: 100% food-grade plastic
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Colour: Black (prevents algae growth)
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Flexibility: Easily cuts with scissors or pipe cutters, bends without kinking
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Compatibility: Direct fit for IWS Pro and Trident systems; works with IWS AutoDrain Brain Controllers and Run to Waste setups; suitable for DIY hydroponic systems with compatible fittings
Who this is for
- Existing IWS system owners replacing clogged, damaged, or aging tubing
- Growers expanding IWS setups — adding plants without replacing core infrastructure
- DIY hydroponic builders sourcing compatible tubing for custom systems
- Anyone running Medusa Run to Waste Systems or similar setups requiring flexible distribution pipe
- Growers dealing with root blockage who need fresh pipework and want to prevent future issues
Particularly well suited to setups where system compatibility and long-term reliability matter more than buying the cheapest tubing available.
Our take
If you've got an IWS system or you're building a hydroponic setup with compatible components, this is the tubing to grab. It's food-grade, it flexes where you need it to, and it handles nutrient solution without breaking down. The 25mm Pro is worth considering if you're running larger systems or planning to scale — it's the same price per metre as 13mm Standard but moves more volume, which matters when you're feeding multiple containers.
Good time to buy while clearance stock lasts, especially if you're planning system expansion or replacing old pipework. Does exactly what it should, and leaves you with one less thing to worry about.
