Composting toilets are an ideal solution…
- Where it’s not possible or cost-effective to install a conventional toilet
- As an environmentally friendly alternative
- For homes, garages, warehouses, barns, pool cabanas, cabins, mines, RV’s, boats, and other locations
What is Composting?
Composting converts organic matter back to its essential minerals. Aerobic microbes do this in the presence of moisture and air, by converting carbon to carbon dioxide gas, and hydrogen to water vapor. As a result, some 95% of the starting material is evaporated and the resulting compost is recycled back to nature.

What is Composting?
Composting converts organic matter back to its essential minerals. Aerobic microbes do this in the presence of moisture and air, by converting carbon to carbon dioxide gas, and hydrogen to water vapor. As a result, some 95% of the starting material is evaporated and the resulting compost is recycled back to nature.


General Benefits
- No Plumbing
- No Water
- Odor-Free
- Inexpensive Solution
Environmental Benefits
- No Pollution
- Save Water
- Recycle Nutrients
- Little or No Liquid Output
GTG Toilet

SLEEK AND ELEGANT, THE GTG IS SUN-MAR’S SMALLEST AND MOST ECONOMICAL TOILET EVER.
The GTG Urine Diverting Toilet is simple and elegant toilet solution for small spaces. It’s designed to provide a low maintenance solution for use where a conventional toilet is not an option or not cost effective. This model is a great solution for Tiny Homes, Small Cabins, RVs, Vans, Boats, Farms, Basements, Warehouses, Greenhouses, Garages, Barns, Stables, Trailers, Mines, Aircraft Hangars, Yurts, Pools, Sheds, and more!
GTG Composting Toilet Features:
- Elongated seat for extra comfort
- Composting toilet
- Two chambers that separate solid and liquid waste
- Due to the easily accessible and removable solid and liquid chambers, the capacity of the GTG is unlimited!
- Easy to use
- Portable – Goes anywhere so you can too!
- Ultra compact size is perfect for use in small spaces
- Vented for odor free operation (12V dc fan 0.6W 110V, 240V)
- The removable liquid chamber mitigates the need for a safety drain
Dimensions:
- Height: 19.8″
- Width: 15.75″
- Depth: 24″
- Weight: 25 Ibs
- Seat Height: 18″
Self-Contained vs. Central Units
3 Easy Steps to determine
Which model is right for me?
Step 1: Sel-Contained vs. Central Units
Self-Contained Units
Self-Contained units are installed directly in the bathroom.
Main Features:
- Quick and easy to install
- Waterless – no plumbing required
- Electrical units can evaporate all liquids under normal conditions
- Easy to clean having a durable shiny contoured finish
Central Units
Central units have a conventional looking toilet in the bathroom and a separate composting unit. They are available in two styles – low water flush and A/F waterless.
Low water style systems:
- Feature a conventional looking toilet in the bathroom
- Can be connected to multiple bathrooms
Waterless style systems (A/F kit required):
- Feature a conventional looking toilet in the bathroom
- No plumbing necessary
Step 2: Electric vs. Non-Electric
Electric Units
Select an electric composting toilet if you have a standard electricity supply. These units feature high quality fans and thermostatically controlled heaters.
Non-Electric Units
Select these if you have no power or are using alternative energy. These toilets feature a higher capacity ventilation stack.
Dual Voltage
Select the AC/DC Kit if you require the option of operating in a standard electric mode (115 Volt) or with only a 12 Volt 1.4 fan or with no power at all.
Step 3: Capacity
Select a toilet based on the right capacity for your needs. Although advertised capacities can be doubled for short periods, selecting a toilet with the maximum number of users in mind in recommended. Sun-Mar offers units with capacities ranging from 1 adult to 6 adults (or a family of 8).
Central Units
Toilet Options for Central Units
Sun-Mar units are designed for easy installation!
All Units Include:
- Vent kit
- Warranty card
- Owner operating and care manual
- Starting accessories including Compost Sure bulking agent
- Compost Quick enzyme for cleaning and accelerating composting and Microbe Mix bacteria

Sun-Mar Garden Composters
Patented Double Drum Composters with Autoflow
Available in two sizes:
- Sun-Mar 200
- Sun-Mar 400


Sun-Mar 200
The SUN-MAR 200 is a continuous composter with a 6 bushel (50 gal.) capacity, excellent for composting kitchen scraps and a few cut up garden trimmings.
200 Garden Composter Specifications:
- Height: 31”
- Overall Length: 331.2”
- Depth: 24”
- Product Weight: 38 lbs
Sun-Mar 400
The SUN-MAR 400 is a continuous composter with an 11 bushel (100 gal.) capacity (almost twice the size of the 200), excellent for composting kitchen scraps and cut-up materials from small gardens.
400 Garden Composter Specifications:
- Height: 36”
- Overall Length: 42”
- Depth: 28”
- Product Weight: 60 lbs

Why Compost?
A SUN-MAR Garden Composter is a gardener’s dream. You know that by recycling you are doing the right thing, and it’s fun to produce your own compost effortlessly.
Benefits of Composting Your Kitchen and Yard Waste Include:
- Healthier plants, because of the improved soil structure and additional nutrients in the compost
- Reduced waste disposal costs
- FREE source of fertilizer
- Reduced water bills, because soil mixed with compost retains water better than regular soil
Four Reasons You’ll Enjoy Using Our Sun-Mar Composters:
- You’ll be creating first class compost material
- You’ll send less waste to the dump
- You’ll have easy to use, top-of-the line equipment
- Less likely to be bothered by pests

Composting the SUN-MAR way
Keep the compost moist and oxygenated.
This means rotating the drum regularly to add oxygen, and adding water when the compost gets dry.
Aim for the right carbon/nitrogen ratio.
Adding a mixture of kitchen and regular yard waste is effective, but for better, faster results, add carbon-rich material (browns) like sawdust, straw, dry leaves, or wood chips. These balance the nitrogen-rich green material and kitchen waste. Chop up the waste if possible: the smaller it is, the faster the breakdown process.
Keep the compost warm.
This is not usually a concern because the compost in the drum and the drum’s insulating properties keep the heat in. If you use only kitchen waste, you may need to add bulking material or pre-composted material to help with oxygen penetration as the drum rotates.