GARANTIA® ECO-Master Compost Bin 300L

(8 customer reviews)

Original price was: £43.99.Current price is: £37.39. inc VAT

FREE Delivery by Sunday, 16 June, 2024.

Crafted from 100% recycled materials, the 300L Eco-Master compost bin features an ergonomic a sleek one-piece feed opening and a wind-protected lid. Easy assembly will have you composting in no time.

This item: GARANTIA® ECO-Master Compost Bin 300L
Original price was: £43.99.Current price is: £37.39. inc VAT
Original price was: £43.99.Current price is: £37.39. inc VAT
Original price was: £31.44.Current price is: £22.99. inc VAT
Do I need a soil fence? The soil fence prevents any rodents or small animals from burrowing under and into the composter. A soil fence isn’t needed but if you have any rodents or other small animals in your area then it might be something you will need to consider.
Length: 600mm - Width: 600mm - Height: 900mm
Product price
inc VAT
Additional options total:
inc VAT
Order total:
inc VAT
SKU: 628000 Brand:


The ECO-Master is an easy to assemble compost bin that just snaps together! Before you build and fill your composter, choose a suitable location with easy access to the house and garden. Think of your neighbours (and any possible smells!) and install it at least 0.5 m away from other properties.


  • Make sure your composter is on a flat surface
  • It needs to be in contact with loosened soil for the flow of microorganisms
  • Choose a sunny or partly shady position
  • Wind-protected, but not windless position
  • The Thermo King floor grid (accessory) provides protection against rodents

What to put in your composter:

  • Fruit and vegetable matter, coffee and tea grounds, eggshells (crushed), potted plants, cut flowers, used potting soil.

What must not be put in your composter:

  • Meat and meat products, fish, leftovers, bread, cheese rind, bones, sick plant parts, ashes from coal and barbecue coal, cigarettes, vacuum cleaner bags, street rubbish.

Free Delivery

  • Delivery lead time is 4-6 working days on all orders however for our large underground rainwater tanks please allow 7-14 days.
  • Price is included to mainland UK, quotations for highlands and islands available on request.
  • We use a number of different hauliers and also deliver on our own vehicles.  We try to provide a tracking number for all orders but can accept customer enquiries by phone and email if you don’t receive a tracking number.
  • Decorative water butt orders will be palletised curbside deliveries.  The customer being home to accept the delivery is advised but not essential.


You have 30 calendar days to return an item from the date you received it. To be eligible for a return:

  • Your item must be unused and in the same condition that you received it.
  • Your item must be in the original packaging.
  • Your item needs to have a receipt or proof of purchase.


Once we receive your item, we will inspect it and notify you that we have received your returned item. We will immediately notify you of the status of your refund after inspecting the item. If your return is approved, we will initiate a refund to your credit card (or original method of

You will receive the credit within a certain amount of days, depending on your card issuer’s policies.

Additional information

Weight 6 kg
Dimensions Length 600 mm x Width 600 mm x Height 900 mm

300 Litres

Colour/ Material



3 Years

8 reviews for GARANTIA® ECO-Master Compost Bin 300L

  1. Paul Wilcox

    Just the right size for a small garden. Delivered promptly and erected in 5 minutes, what more could you want?

    • Garden Tech

      We’re glad we could exceed your expectations! Thanks for the review Paul.

  2. Paul Carr

    Slick delivery, easy assembly, smart and eco-friendly too. What’s not to like? Highly recommended.

    • Garden Tech

      We’re delighted to have met your expectations Paul. Thank you!

  3. Sara

    Really happy with our purchase, great value for the price. Sturdy product and delivery was quick with updates, would highly recommend, thank you!

  4. Keith Bradish

    Excellent product and excellent service. Don’t bother looking elsewhere. Impressive quality for the very reasonable price. Arrived promptly with sturdy packaging.

  5. Tracey Graham

    After visiting three garden centres, all of which had no composters in stock, I turned to the Internet and chose this composter. I noticed many plastic composters were available on eBay, Amazon, and other platforms, but they all seemed flimsy and had poor reviews regarding assembly difficulties. This Garantia compost bin is robust, incredibly easy to assemble, and fits perfectly in my city flat garden. It was promptly delivered upon ordering by a reputable company that provided a delivery time slot. The packaging was also well done. I am absolutely delighted with this product, as well as the seamless purchasing and delivery process of my composter. Five stars to you at GardenTech!

  6. Steve Holder

    Great value. Arrived in time, well packaged, very easy to assemble. Looking forward to using them. Definitely recommend.

    • Garden Tech

      Thanks for the kind words Steve! We hope you like your new Garantia ECO-Master Composter 🙂 Best wishes! The Garden Tech Team

  7. Benji Sutton

    My EcoMaster 300 litre compost bin was delivered 3 days after ordering online. It was well packaged and secured. All parts were in good order and of sturdy construction. I am very pleased with this compost bin and will most likely order another.

  8. Martin Saunders

    A large plastic compost bin which works really well. It’s very well made and looks durable in comparison to other garden composters I’ve used before. 5 stars *****

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How do composters work?

Composters, also known as compost bins work through heat, moisture, and air; where the bacteria breaks down the carbons 0f garden and food waste. Compost is very good for plants and can encourage growth, so it is no surprise to see more and more people making their own compost rather than store-bought packs.

Simply put the food waste or garden waste (lawn trimmings etc) into the composter, and assuming the material is biodegradable, eventually, over time this will break down to create a nutrient-rich mulch. This can then be put onto plants and borders, to help encourage growth.

What size compost bins do you sell?

Garden Tech stocks 280, 300, 400, 450, 600, 900, and 1000 litre composters.

How do I remove the compost from my composter?

Our compost bins have a small, easy access door at the bottom to allow you to collect the compost.

What is a soil fence?

A soil fence composter barrier will prevent rodents and burrowing creatures from getting into your composter while allowing worms and micro organises to pass freely between your compost and the soil.

What size compost bin do I need?

The size of the composter that you require is determined by the volume of vegetable material to be composted. A 300-litre bin is ideal for beginners, but large families and avid gardeners may wish to go bigger.

Do you have replacement lids?

Garden Tech can offer replacement lids, if requested.

How many compost bins do I need?

Many customers prefer having two compost bins as it also gives you a place to store finished compost to use in the garden as and when needed.

What size should a compost bin be?

In general, bigger is better, but 3 feet by 3 feet (1000mm x 1000m) is a manageable size for most gardeners. The compost bin(s) should be placed in full sun, if possible – shade will of course reduce the temperature and slow down the composting process.

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