Sun-Mar Garden Composter 400

by Sun-Mar
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Garden Composter

The Sun-Mar 400 is an 11 bushel or 100 gallon continuous composter that is excellent for composting kitchen scraps and materials from small gardens. This unit incorporates Sun-Mars patented double drum AutoFlow design. With Autoflow, material goes in the top and compost exits automatically out the end. As the drum rotates, compost moves along the outer drum and then back through the inner drum before dropping from the output port.


  • Compost discharges automatically
  • Pest Proof
  • No waiting for batches to finish
  • Fast and Odorless
  • Easy loading and turning
  • Solid construction -UV stabilized Poly-ethylene -100% recyclable

The 400 is considerably bigger than the 200, but otherwise it works on the same principle as the 200. The 400 is a continuous composter designed for composting kitchen scraps and a cut up materials from small gardens.


Drum Volume: 366 Liters (approx: 11 bushel or 100 gallon)
Height: 36"
Depth: 28"
Overall Length: 42"
Product weight: 60 lbs

SUN-MAR 400 is ideal for kitchen Scraps and cut up materials from a small garden. As with the 200, material is added to the 400 by sliding the input door open. To mix and aerate the compost, the 400 drum is rotated by turning a shaft on which a small gear bears directly against the gear teeth on the drum. Compost is removed by opening the output port, rotating the drum and allowing compost to fall from the inner drum into a bushel basket or other container. Included with the SUN-MAR 400: Optional Rollers The unit has optional rollers, which can be snapped into the cradle base to make it easier to move the unit when it is on a hard surface. Sample Compost Swift The 400 has a sample bottle of Compost Swift which you can use diluted by 8 to 1 to help get your composter going. If you like it, there is a large 32 oz bottle available. Spare Parts includes 2 spare vent plugs and one spare drum cap.

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