Loop turns your dirt around. It’s just one of the many environmental benefits we get from using Loop to enrich the soil. 

Loop, loaded with nutrients and organic matter, makes the earth a better place and provides many environmental benefits. Organic matter is the best thing to add to soil because it holds nutrients for future use by microorganisms and plants. It also improves soil structure and acts like a sponge to help absorb and retain moisture. Because of this, Loop reduces stormwater runoff, erosion and sediment buildup in our waterways.

Loop enriches soil with essential nutrients that are slowly released as plants need them. These nutrients include nitrogen, phosphorus and potassium as well as micro-nutrients such as calcium, magnesium, sulfur, copper, iron, selenium, and zinc, all of which are vital for plant growth. Loop’s nutrients and organic matter feed the plants in a healthy, natural way, helping them grow bigger and better.


Using Loop decreases our carbon footprint

Choosing to use Loop as a fertilizer replacement doesn’t just help the soil and plants, it also stores carbon while reducing our carbon footprint. Loop helps fight climate change so much, it’s actually one of the main reasons the King County Department of Natural Resources and Parks is carbon neutral. 

Loop achieves its dark earthy hue because it is loaded with carbon. University scientists have studied sites where Loop has been used and found it stores carbon in the soil and reduces greenhouse gas emissions into the atmosphere. By using 100% of Loop as a soil amendment over 42,000 tons of CO2 equivalents are offset each year. That’s like taking over 8,000 cars off the road!

Adding Loop to soil offsets greenhouse gas emissions in 3 major ways.

  • For starters, some of the carbon we add to soil stays there for a long time, which keeps some of the finite amount of carbon on earth out of the atmosphere and buries it in a huge carbon sink – soil. This process is called carbon sequestration and it’s an approach to mitigating some of the problems associated with climate change.
  • Secondly, adding Loop to soil makes plants grow bigger faster which means more plants can take more carbon out of the atmosphere via photosynthesis. These plants not only store carbon in their tissues but eventually they’ll drop leaves and branches on the soil surface, helping to store even more carbon in the soil.
  • Lastly, when gardeners and commercial growers use Loop they are usually using it instead of synthetic fertilizer. Synthetic fertilizer takes a tremendous amount of fossil fuel to manufacture. In contrast, the production of Loop is a source of energy rather than a waste of it. From the anaerobic digestion process used to make Loop, King County treatment plants capture and use renewable methane gas instead of natural gas or electricity. Using Loop helps us avoid the greenhouse gas emissions associated with synthetic fertilizers and instead supports a renewable, carbon-neutral energy source.

Waste not, want not: Loop is endlessly renewable

Using Loop as a fertilizer replacement and soil builder is a cost effective, socially responsible, and environmentally beneficial choice for our community.

King County processes 175 million gallons of raw wastewater every day. This means that at the end of the year, about 120,000 wet tons of Loop have been taken out of the wastewater and processed for use. Using a favorite metric, that’s enough Loop to cover a football field to a height of 67 feet. With 1.7 million citizens contributing to the wastewater, there doesn’t seem to be an end of Loop in sight. One of the best things about using Loop as a soil amendment is that all those tons of beneficial nutrients and good carbon are put to good use, not wasted in a landfill or incinerated. 

And King County just doesn’t clean the water and make Loop, we also create two more renewable resources: biogas and recycled water

Loop is a source of energy, not a waste of it

Producing synthetic fertilizers uses massive amounts of energy and contributes to increased greenhouses gasses in the atmosphere; just imagine the energy associated with mining mineral phosphates and pelletizing nitrogen gas. By using a recycled product such as Loop, we are avoiding the greenhouse gas emissions associated with synthetic fertilizers.

In contrast, Loop production creates energy via the capture of methane gas emitted by microbes as they feast on raw wastewater solids inside anaerobic digester tanks at the wastewater treatment facilities. Some of this gas is used to power engines at the treatment plants while the rest of it is sold to local power utilities for distribution to their customers.

One of the best things about using Loop as a soil amendment is that it helps us to fight climate change.


Another cool thing about Loop is that it’s endlessly renewable. Loop returns beneficial nutrients back to the soil where plants can use them.

Loop Nutrient Graphic