Additional beige terracotta composting ring, three-quarter view on a white background

Exploded diagram of the terracotta indoor worm composter, either as an 8 L unit or with a second ring bringing it to 16 L

Extra composting ring for Compost'In

Name: Extra composting ring for Compost'In
Brand: Agrotonome
Price: 67.98 USD
Availability: OutOfStock

$67.98

$22.66 × 3 with no fees Klarna.

This second 8-litre terracotta ring stacks onto the indoor terracotta worm composter and brings its volume to 16 litres, suitable for a household of three to four people. It is added when the first ring overflows before the compost has had time to mature.

Composting accessory

Customer support 7 days a week by email

Delivery within 2 to 15 business days

100 % secure payment

The summary

What it is: a second 8-litre clay ring for the indoor worm composter.
What it changes: the volume increases from 8 to 16 litres, suitable for three to four people.
When to add it: when the first ring overflows before the compost has had time to mature.
Compatibility: it stacks exclusively with the terracotta indoor worm composter.

8-litre clay tray that stacks onto the indoor worm composter

The additional composting ring for Compost'In is a second 8-litre clay tier that stacks onto the indoor terracotta worm composter. It increases the volume from 8 to 16 litres, which suits a household of 3 to 4 people. Add it when the first ring overflows before the compost has matured.

This clay composting ring fits onto the indoor terracotta worm composter and doubles its working volume. The composter goes from 8 to 16 litres, and you carry on composting in the same kitchen, with the same lid and the same supply of sawdust, which simply move to the top of the second tier.

This second tier is for when your household produces more peelings than the first ring can absorb between two harvests. An 8-litre ring suits one to two people, and two rings suit three to four, guidelines that depend on how much fresh veg you cook. If the family grows, or if you prepare more meals at home, this second tier saves you from changing composter or installing a second one next to the first.

🧱 One extra tier, same clay

The ring is made from the same micro-porous clay as the composter, by the same ceramics company. Its wall lets excess water evaporate, so an extra tier adds no compost liquid to empty and the material keeps the dampness of a wrung-out sponge, which is what worms like. Once the ring is in place, the composter stands about 37 cm high instead of 22: measure the space under your wall cupboards before ordering, since you lift the lid each time you add waste.

A colony that scales with volume

The composting cycle shortens to 3 months when the worms occupy the whole space of the composter, and a doubled volume needs a larger colony to fill it. If yours is still sparse, a batch of compost worms added along with the ring helps it colonise the new tier. A well-established colony will then multiply on its own according to the food available.

🔁 The two-tier routine

Nothing changes in what you do: you add the peelings cut into small pieces, then a handful of sawdust taken from the reservoir, and you close the lid. The worms mix and aerate the material as they move through it, without you having to stir, and they gradually occupy both levels as the colony multiplies. The compost is ready when you can see the same sign, when you find almost no worms left in it, and it then goes into your pots, planters and houseplants.

The material is constantly compacting in the two rings, since it takes about 20 kg of peelings to make 1 kg of compost. When the composter is nonetheless full, a compost activator speeds up decomposition by about 30% for a month, long enough for you to resume your additions. Sawdust is also used up faster with two levels: the annual accessories pack contains two 400 g bags of sawdust and two bags of activator, enough to cover a year.

☕ At the office or in a shared house

The indoor worm composter also finds its place outside a family kitchen, in a shared house or in a company canteen. In a canteen, only meals and breaks taken on site feed the composter, so an 8-litre ring there handles the waste of about ten people and two rings handle about twenty. Coffee grounds, split tea bags and fruit peelings go in just as they would at home, each time covered with a handful of sawdust. Meat or fish scraps, citrus fruit, garlic and onion, on the other hand, stay out of the bin, and the building's or the council's food waste bin takes them.

📦 What's in the box

The box contains the clay ring on its own, without a lid or reservoir, since those of your composter serve both tiers. It weighs 3 kg and stacks onto the first ring without tools. It matches the 26 cm diameter of the indoor worm composter it is designed for, so it fits neither a tray-type worm composter nor a bury-in-the-ground pot. Like the composter, it develops a patina over time and takes on a shade of its own.

Technical specifications

The ring

Volume added: 8 LThe composter goes from 8 to 16 L of composting capacity.
Burner with two rings: 3 to 4 peopleA single ring suits one to two people.
Material: Micro-porous clayExcess water evaporates through the wall, with no compost leachate to empty.
Weight: 3 kg

Once assembled

Composter: Compost'In indoor worm composterIt includes the lid and the sawdust reservoir from the composter.
Assembly: Stacked, tool-free
Overall height: Around 37 cmThe composter measures 22 cm with a single ring.
Company canteen: Up to 20 peopleAround ten people with a single ring.

In the box

1 terracotta composting ring of 8 L

Volume, weight, heights, spawning groups, refectory numbers and compatibility: values from the manufacturer Agrotonome, recorded on 11/10/2026. Spawning groups and numbers are orders of magnitude.

Estimate your
delivery time

3 kg clay ring, made to order, fragile and packed accordingly. Unpack it carefully and check the wall before stacking it. The exact charges are shown in the basket once you have entered your address.

Frequently asked questions

8 questions

6 key questions, 8 in the detailed view

Does this ring fit any worm composter?

How many litres do you gain with the ring?

When should the second ring be added?

Do you need any tools to install it?

Do you need to add worms at the same time?

Does the ring produce compost leachate?

What height does the composter reach with two rings?

Does the ring change how the composter is maintained?

Let us talk about your project

A question about this product or your setup? Our team will answer and advise you.

Email us Contact form

Interest-free instalment payments

Offered depending on the cart amount, at checkout.

Delivery in 2 to 15 working days

Depending on the products and shipping sites. Estimate by destination in the estimator on this page.

After-sales service 7 days a week by email or chat

Our team answers all your questions.

Shop responsibly

Become part of the change.

Extra composting ring for Compost'In

The summary