Use the pipe to cover a length or a large volume with a single run, and the stones to oxygenate a specific tank. The two work very well together: a pipe in the buffer reservoir and a stone in each grow tank.

Version Inner diameter Nozzle 16 mm 12 mm 12 mm ribbed 20 mm 10 mm 10 mm ribbed Choose the version that matches the fittings on your air line.

Remove it from the water and unplug it. Soak it in a solution of water and vinegar. Rinse it thoroughly under clean water. Place it back in the water, weighted down. When cleaning no longer produces any improvement, cut a fresh length from the roll.

Section of Growrilla air diffuser pipe, black porous sleeve marked with a blue line, curved

Coil of Growrilla air diffuser pipe, rolled and banded, black sleeve with blue trim

Porous air diffuser pipe, 16 or 20 mm

Name: Porous air diffuser pipe, 16 or 20 mm
Brand: Growrilla
SKU: GROW-PACK-PORTU1610-5
Price: 12.5 EUR
Availability: InStock

12,50 €

This porous diffuser pipe releases air along its entire length and replaces a series of air stones in a tank, a pond or a buffer reservoir. It is sold in rolls of 5, 10 or 25 metres, in 16 mm with a 12 mm connector or in 20 mm with a 10 mm connector.

Ref. GROW-PACK-PORTU1610-5·Hydroponic aeration accessory

Diameter : 16 mm × 5 m

16 mm × 5 m

20 mm × 5 m

16 mm × 10 m

16 mm × 25 m

20 mm × 10 m

20 mm × 25 m

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Delivery within 2 to 15 business days

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The summary

What it is: a porous pipe that releases air through its wall along its entire unrolled length.
Two diameters: 16 mm with a 12 mm fitting, 20 mm with a 10 mm fitting.
Available in rolls: 5, 10 or 25 metres, cut to the length you need.
What it replaces: a series of air stones and the fittings that supply them.

Porous pipe that diffuses air along its entire length, in 16 or 20 mm

The Growrilla porous air diffuser pipe releases air through its wall along its entire length and replaces a series of air stones in a tank, a pond or a buffer reservoir. It is sold in rolls of 5, 10 or 25 m, to be cut to length, in 16 mm for a 12 mm connector or in 20 mm for a 10 mm connector.

An airstone diffuses at a single point; this pipe diffuses along a line. Its wall is porous along its entire length, and the air you push through it escapes all at once, forming a curtain of fine bubbles rather than a single column. The difference is most noticeable in large volumes and elongated tanks, where a single emission point leaves areas where water circulation is poor.

🌬️ A curtain rather than a column

The pipe is sold in rolls of 5, 10 or 25 m, and you cut it to the length of the tank to be fitted. It comes in two versions, which differ in their diameters and therefore in how they connect: the 16 mm version has an inside diameter of 12 mm and fits onto 12 mm barbed connectors, while the 20 mm version has an inside diameter of 10 mm and fits onto 10 mm connectors. Choose according to the fittings on your air line.

A single circuit

A single length of pipe replaces several airstones and the fittings that supply them.

Continuous diffusion

Air is released along the entire length, regardless of the shape of the tank.

A choice of lengths

The roll can be cut to fit the base or the sides of the tank.

The result depends mainly on the air supply. If you feed a long pipe from one end only, it releases a lot of air near the inlet and progressively less further along, because the pressure drops along the line and the last few centimetres release almost no air at all. If your line is longer than the width of a tank, feed it from both ends using a T-fitting, or shorten it.

Weight down the pipe before starting up

The porous material of the pipe is light, so it tends to float up to the surface. Fix it to the bottom with suction cups or weigh it down before switching the pump on, otherwise you will find it at the surface at first start-up, where it no longer diffuses anything useful. In a wide tank, lay it in a loop along the walls rather than in a straight line down the middle: the circulation is more even and the line does not get in the way of the baskets.

Measuring the oxygen the pipe delivers

Dissolved oxygen cannot be judged from a curtain of bubbles, and the dissolved oxygen drop test gives you the value in a few minutes. Take one reading before fitting the pipe, then a second a few days later, at the same time of day, to find out what the line really contributes. In a pond, repeat it in hot weather at the end of the night, when oxygen is at its lowest.

On the growing side, the same roll can be laid out at the bottom of a 19 L tank, a buffer reservoir or a raft grow bed, beneath the roots. In an RDWC network, it complements the air stones in the tanks by aerating the reservoir that feeds them. Your air pump should then be sized for all the lines together, stones and pipe included, since each one takes its share of the available air.

🐟 The roller in a pond

In your pond or aquaponic rearing tank, the dissolved oxygen content falls as the water warms, while the fish consume more of it. Fresh water at saturation holds about 9.1 mg/L of oxygen at 20 °C, but only 7.6 mg/L at 30 °C. A curtain of bubbles spread over several metres aerates the whole volume, whereas a single diffuser placed in a corner leaves areas where the water barely circulates. The pipe replaces neither filtration nor water circulation, but it supplements aeration during the hot months.

🔌 Connecting the line

The air line coming from your pump connects to a barbed fitting pushed into one end of the porous pipe, matching the inside diameter of the version you have chosen. The other end is sealed with a barbed plug of the same diameter, otherwise the air escapes through the open end instead of passing through the pipe wall. Cut the pipe cleanly and at a right angle, so that the fitting sits snugly in it without letting air leak.

🧽 What blocks the pores

A porous pipe clogs up just as a stone does, from the inside as much as from the outside, through biofilm, limescale and deposits from the nutrient solution. The symptom is always the same: bubbles that grow larger and become sparser. Soaking in vinegar water followed by a thorough rinse lets you put it back into service several times, before you have to cut a new length from the roll, as with the air stones that it complements or replaces.

Technical specifications

The essentials

What it is: Porous diffuser pipe
Outer diameters: 16 or 20 mm
Inner diameters: 12 or 10 mmIn the same order as the outer diameters.
Connection: Barbed fitting of 12 or 10 mm
Lengths: 5, 10 or 25 m
Diffusion: Along the entire length
Uses: Tank, buffer reservoir, pond
Origin: Italy

To budget for separately

Air pump: 1 pump matched to the length
Ballasting: Suckers or weights

2 further specifications are available in the detailed view.

In the box

1 roll of porous diffuser pipe, in the chosen diameter and length.

Diameters, fittings, buoyancy and uses taken from the manufacturer's product pages on 07/10/2026. Oxygen saturation: USGS tables.

Manufacturer and product safety

Manufacturer: Growrilla di Milone Giulio
Postal address: Via Fiano 207, 10070 Robassomero (TO), Italie
Contact: info@growrillahydroponics.com
Website: growrillahydroponics.com

Information provided under Regulation (EU) 2023/988 on general product safety.

16 or 20 mm?

Both pipes diffuse in the same way along their entire length. Their diameters determine which fittings they connect to.

The diameter is chosen according to the fittings Both pipes diffuse in the same way. What sets them apart is the nozzle they fit onto and the fixings that hold them to the bottom.

	Outer diameter (mm)	Internal diameter (mm)	Connection fitting	Diffusion	Available lengths	Cut to length	Price
Recommended 16 mmYour choice	16 mm	12 mm	12 mm barbed fitting	Along the entire length	5, 10 or 25 m	Yes	12,50 €
20 mmYour choice	20 mm	10 mm	10 mm barbed fitting	Along the entire length	5, 10 or 25 m	Yes	13,90 €

16 mmRecommended

The pipe

Outer diameter (mm)16 mm

Internal diameter (mm)12 mm

Connection fitting12 mm barbed fitting

Common to both

DiffusionAlong the entire length

Available lengths5, 10 or 25 m

Cut to lengthYes

20 mm

The pipe

Outer diameter (mm)20 mm

Internal diameter (mm)10 mm

Connection fitting10 mm barbed fitting

Common to both

DiffusionAlong the entire length

Available lengths5, 10 or 25 m

Cut to lengthYes

Diameters and connection details taken from the manufacturer's product pages on 07/10/2026.

Estimate your
delivery time

The pipe is coiled for dispatch, keeping the parcel compact even at 25 metres. Orders are shipped from the workshop in Robassomero, near Turin. Exact shipping costs and final delivery times are shown at checkout once you have entered your address. Outside the European Union, import duties and taxes remain the responsibility of the recipient.

Frequently asked questions

6 questions

6 key questions

Pipe or air stones?

16 or 20 mm?

Version	Inner diameter	Nozzle
16 mm	12 mm	12 mm ribbed
20 mm	10 mm	10 mm ribbed

How much length to unroll?

Does the roll overlap itself?

And in a fish-rearing setup?

How to clean it?

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Porous air diffuser pipe, 16 or 20 mm

The summary