Reencle vs. Mill: Which Electric Composter Actually Makes Real

This comparison is written by Reencle. Details about Mill come from Mill's public information at the time of writing. Mill is a trademark of its owner, and Reencle is not affiliated with it. Check mill.com for current pricing and specs.

Quick Answer: Both Reencle and Mill are premium kitchen appliances for food waste, but they do not do the same thing. Reencle uses a living microbial culture to break food down into real compost, ready in about 30 days. Mill uses heat and grinding to dry food waste into a material it calls "Food Grounds," which Mill's program collects and sends to farms as chicken feed. If you want compost, the process that produces it matters.

Table of Contents

• How Each System Works
• What Does Each Produce?
• Head-to-Head Comparison
• What Does the Science Say?
• A Note on Subscription Models
• Which Is Right for You?
• Frequently Asked Questions
• References

How Each System Works

Both Reencle and Mill sit on your kitchen counter and accept daily food scraps. Beyond that shared starting point, they operate on fundamentally different principles.

Reencle: Biological Decomposition

Reencle is an aerobic composting system. Inside the drum is a living culture of microorganisms that actively break down organic material through biological decomposition. The unit maintains the temperature, humidity, and aeration conditions those microbes need to thrive, essentially replicating the conditions of a healthy outdoor compost pile in a closed, low-odor enclosure.

Food scraps added to Reencle are broken down by microbial activity over time, not by heat alone. What remains is real compost with living microorganisms still in it.

This is composting. Not as a marketing term, as a biological process.

Mill: Dehydration and Grinding

Mill works through a different mechanism entirely. The unit heats food waste at temperatures sufficient to evaporate moisture, then grinds it into a dry, shelf-stable material that Mill calls "Food Grounds." The process is closer to industrial food drying than to composting.

Mill's process dries the scraps with heat instead of relying on a living microbial culture. The output is dry and much smaller in volume than the original waste. Mill does not describe this output as compost. Mill's program collects Food Grounds and sends them to farms as chicken feed.

Both systems are well-engineered for what they do. The critical distinction is what they actually do.

What Does Each Produce?

Reencle: Biologically Active Compost Material

The material that comes out of Reencle's drum is real compost, made by living microbes. It is ready in about 30 days.

Healthy Reencle compost is dark, moist, and crumbly, and it smells earthy. Mixed into soil, it adds organic matter and living microbes.

Mill: Food Grounds (Dehydrated Food Waste)

Mill's output, which the company calls "Food Grounds," is a dry material that has been heat-processed and ground. It has been dried, not broken down by microbes over time.

Mill's program collects Food Grounds by mail and sends them to farms as chicken feed. Mill calls them Food Grounds, not compost.

The distinction matters for anyone shopping in this category expecting a garden-ready output. Food Grounds and compost are not the same material and do not behave the same way in soil.

Head-to-Head Comparison

What Does the Science Say?

The central scientific question in this comparison is whether dehydration produces compost. The answer, by standard soil science definitions, is no.

Composting is defined as the biological decomposition of organic material by microorganisms under controlled aerobic conditions. The outputs of composting, stable humus, microbial biomass, and plant-available nutrients, are the products of that biological activity. The USDA, the U.S. Composting Council, and academic soil science literature are consistent on this definition.

Dehydration removes moisture and reduces volume through heat. It does not involve microbial decomposition. The dried output retains the organic compounds present in the original food waste but has not been transformed through biological activity. It is still, in chemical terms, food waste, just dried.

This matters practically when the dried material is applied to soil. Dry, carbon-rich organic material applied directly to garden beds can temporarily tie up available nitrogen as it begins decomposing in the soil, a phenomenon soil scientists call "nitrogen drawdown" or "nitrogen immobilization." Soil microorganisms consume nitrogen to break down carbon-rich material, which can temporarily deprive plants of the nitrogen they need. Fully finished compost does not cause this effect because the carbon has already been largely transformed.

That is why dried food material is usually mixed into soil or a compost pile and given time before planting.

For gardeners who want to improve soil biology, not just add organic bulk, the process used to produce the amendment is directly relevant to the result they will see in the garden.

A Note on Subscription Models

Mill's business model includes a monthly subscription service for the pickup and redistribution of Food Grounds. Check mill.com for current subscription pricing. Without the membership, you decide what to do with the dried Food Grounds yourself. Check Mill's current guidance.

The ongoing subscription cost is a meaningful factor in the total cost of ownership.

Reencle does not require a subscription. The output stays with the user and goes directly into the garden. The only routine ongoing cost is the carbon filter, replaced every 9 to 12 months. You don't replace the microbes on a schedule. No subscription. No pods. No refills.

Which Is Right for You?

This is a genuine trade-off decision, not a clear-cut one. Here is an honest framework.

Choose Reencle if:

• Your goal is to produce garden compost, to build soil biology and add finished organic matter to your beds
• You garden regularly and want a consistent, year-round source of compost from your kitchen
• You want to avoid an ongoing subscription model and keep the output of your system
• You are committed to the biological process of composting, not just volume reduction of food waste

Mill may be worth considering if:

• Your primary goal is reducing the volume of food waste in your home, and you are comfortable with the output going elsewhere (feed programs, municipal composting)
• You have no garden or minimal interest in using compost yourself
• You are comfortable with a membership model
• You prefer a dry output that is collected and sent away

The key is aligning your choice with what you actually want the output to do. If the answer is "go into my garden as compost," Reencle produces that. If the answer is "leave my house in the cleanest form possible," Mill's system serves that goal.

Frequently Asked Questions

Does Mill make real compost?

No. Mill's output, which the company calls "Food Grounds," is food waste that has been dried and ground with heat. It has not been broken down by microbes over time, which is what makes compost. Mill does not describe its output as compost.

Can I put Mill Food Grounds in my garden?

Check Mill's current guidance. In general, dried food material that has not been broken down by microbes can pull nitrogen from the soil while it breaks down, so it is usually mixed in and given time before planting. If you want compost for your garden, Reencle makes real compost, ready in about 30 days.

Which is better for the environment, Reencle or Mill?

Both divert food waste from landfill. That matters, because landfilled food waste produces methane, a potent greenhouse gas. One Reencle Prime unit avoids an estimated 0.39 metric tons of CO2 per year. Both approaches beat throwing food waste in the trash. The question is whether you also want compost for your garden.

Is Mill more convenient than Reencle?

Mill's dehydration process is largely hands-off and produces a dry, shelf-stable output that does not require active management of a living microbial culture. In that sense, it has a lower operational complexity. Reencle's living microbe culture asks for a little more attention, because you are running a biological system, not just a machine. The compost is ready in about 30 days. However, Reencle's subscription-free model means one less recurring task and bill. Convenience depends on what you weigh more: operational simplicity or subscription logistics.

Which is more expensive long-term?

Mill's total cost of ownership is generally higher over a multi-year horizon when the subscription is factored in. Mill has listed its unit at $999 when bought outright, and the Food Grounds program adds a membership fee. Check mill.com for current pricing. Reencle's upfront cost is $399 to $699 depending on the model (Prime $549), and the only routine ongoing cost is the carbon filter, replaced every 9 to 12 months. There is no subscription.

References

1. Reencle Official Product Page, reencle.co
2. Mill Official Product Page, mill.com
3. U.S. Composting Council, Compost Definition and Standards: compostingcouncil.org
4. U.S. Environmental Protection Agency, Composting At Home: epa.gov/recycle/composting-home
5. USDA Natural Resources Conservation Service, Soil Health and Compost: nrcs.usda.gov
6. Rynk, R. et al., "On-Farm Composting Handbook," NRAES-54, Cornell University (1992), foundational reference on aerobic composting biology
7. Magdoff, F. & Van Es, H., "Building Soils for Better Crops," SARE Handbook (3rd ed.), nitrogen immobilization and organic matter dynamics
8. BioCycle, Compost Quality and Maturity Standards: biocycle.net