Sun-Mar Sun-Mar GTG Urine Diverting Composting Toilet GTG-01
Sun-Mar Sun-Mar GTG Urine Diverting Composting Toilet GTG-01
Sun-Mar Sun-Mar GTG Urine Diverting Composting Toilet GTG-01
Sun-Mar Sun-Mar GTG Urine Diverting Composting Toilet GTG-01
Sun-Mar Sun-Mar GTG Urine Diverting Composting Toilet GTG-01
Sun-Mar Sun-Mar GTG Urine Diverting Composting Toilet GTG-01
Sun-Mar Sun-Mar GTG Urine Diverting Composting Toilet GTG-01
Sun-Mar Sun-Mar GTG Urine Diverting Composting Toilet GTG-01
Sun-Mar Sun-Mar GTG Urine Diverting Composting Toilet GTG-01
Sun-Mar Sun-Mar GTG Urine Diverting Composting Toilet GTG-01

Sun-Mar GTG Urine Diverting Composting Toilet

Sun-Mar GTG Urine Diverting Composting Toilet

Regular price $766.00
  • FREE Shipping and No Tax (It's On Us!)
  • Ships in 7 - 10 Days
  • 30 Day Hassle-Free Returns
  • 30 Day Price Match Guarantee
  • In stock, ready to ship
  • Backordered, shipping soon

Sun-Mar GTG Self Contained Urine Diverting Toilet

Sun-Mar GTG Toilet is a portable toilet with a modern European design that will fit well into any bathroom. Whether you are in a tiny home, yurt, or a RV, the Sun-Mar GTG Toilet installs in minutes and is the ultimate compact toilet that is perfect for small spaces.  Sun-Mar GTG is perfect off-grid solution for anyone that doesn't have access to septic.

Included with your Sun-Mar GTG compost toilet: 

  • Sun-Mar GTG Toilet
    • with Liquids Chamber
    • with Solids Chamber
  • Manual
  • Hardware Kit
    • 2 Floor Brackets
    • 2 Floor Bracket Bolts
    • 2 Floor Bracket Screws
  • 1 Brick of Compost Magic (Coco Fiber)
  • 110v/240AC to 12 V DC Power supply
  • Not included: 1 1/2" vent pipe 

How Sun-Mar GTG Composting toilet works 

The Sun-Mar GTG is a urine diverting toilet that has a solids chamber and a liquids chamber. The urine and solids are separated to prevent the creation of black water and therefore the smell. With venting and with included compost magic (coco fiber) the solids in the solids chamber is vented and dried out eliminate bathroom odors. The solids chamber and liquids chamber are emptied when full. 

Sun-Mar GTG Manual PDF: 

Coming Soon!

Sun-Mar GTG Compost Toilet Dimensions:

  • Weight: 25 lbs 
  • Dimensions: 19.8" H x 15.75" W x 24" D
  • Warranty: 1 Year 
  • Liquids Chamber: 1.85 Gallon (7 Liters) 
  • Solids Bin: 6 Gallons (23 Liters)
  • Material: Polyethelyne

Sun-Mar GTG Compost Toilet Features: 

  • Elongated seat for extra comfort 
  • Low maintenance solution for toilet requirement
  • Modern European Compact Design
  • Quick and Easy Installation 
  • Weight Limit: 300 lbs 

Sun-Mar GTG Video

Free Shipping Promotion:

Shipping costs for our business are typically around $10 for accessories can range and up to $450 for larger items.  However, for a limited time only, we are offering free shipping on all products to the lower 48 states in the U.S.. No minimum order required!

If you would like an order shipped to anywhere else in the world, please email us at, and we will gladly work something out with you! reserves the right to cancel this offer at anytime

Order Confirmation:

After you place your order, you will receive a confirmation email.  This means that we have received your order in our system.  As soon as we receive your order, we automatically reach out to our suppliers to confirm that it is in stock and ready for shipment.  If your item happens to be on backorder, or is otherwise unavailable, we will let you know via email.  Once your item(s) are available for immediate shipment, we will ship the order.

Order Shipment:

Your order will ship within the lead time we have posted on the product page.  We will email you tracking information within 24 hours of your order leaving the warehouse.  If you do not receive tracking information from us by 3 days after the lead time posed on the product page has elapsed, feel free to follow up with us at

Most orders will be shipped by FedEx or UPS. Small items may be delivered by the US Postal Service or by the US Postal Service via FedEx Smartpost or UPS Surepost. Larger items may be delivered via FedEx Ground, FedEx Home Delivery, UPS Ground, or Truck Freight. Items shipping via Truck Freight are clearly marked on our website and catalog. Some special orders may require 2 to 6 weeks depending on the item.

Some large or heavy items require additional shipping and handling charges due to the bulky nature of these products. If an item requires additional shipping and handling charges we will clearly mark this requirement on our website and in our catalog. In most cases, we charge a "flat" rate to ship these items.

Free shipping applies to orders totaling over $99 shipped to a final destination within the contiguous 48 states of the United States. Certain items do not qualify for free shipping regardless of order total. Items that do not qualify for free shipping will be clearly marked on our website. reserves the right to cancel this offer at anytime. Delivery to rural or extended areas, special order, & Truck Freight shipments may take extra days to arrive. Please call (888) 467-5447 for details.

International Orders:

International Orders (except Canada) require special processing. When you are entering an International Order, please complete all the necessary information. We will get a shipping quote from one of our International shippers. We will contact you with the final charges for approval. The order will not be shipped or charged unless it is confirmed by you. Please note: You will be responsible for any applicable taxes and/or duties that will need to be paid upon delivery.

Canadian Orders: We do not ship directly to Canada, however, we will ship to a US-based freight forwarder of your choice! We recommend you first contact the desired freight forwarder to obtain their shipping and receiving processes. You will be responsible for all duties and tariffs on Canadian shipments, along with coordinating with the freight forwarder for delivery to final destination. Please call (888) 467-5447 for assistance, otherwise enter the shipping address provided by your US-based freight forwarder.


ALL SHIPMENT SHOULD BE INSPECTED AT THE TIME OF DELIVERY. DAMAGED PACKAGES SHOULD BE REFUSED. If you notice any damage, you should note it on the freight bill when signing for delivery.  If your product is defective or sustains damage during shipping, please contact us at right away. Remember to keep all the original packaging for any items that need to be returned. All returns need to be authorized by our customer service department prior to being processed.

If delivered by Truck Freight, please contact the freight carrier at the phone number on the carrier’s bill. After contacting the carrier, please call Customer Service at (888) 467-5447 for further assistance with the damaged shipment. Please note, signing for your delivery without noting any damages or inability to inspect the delivery on the relevant paperwork legally states that you have received your freight in good condition and cannot be held liable for any damages, missing pieces, etc. that may be incurred as a result of this decision. Leaving a note or instructions for the driver is considered to be the same as signing for your products in good condition. If you authorize the freight company to leave freight without a signature, cannot be held liable for any damages, missing pieces, etc. that may be incurred as a result of this decision. If you choose to sign for a visibly damaged please note on the relevant paperwork that you are signing for a damaged package; however, cannot be held liable for any damages or missing pieces for accepted via signature delivery.

Cancellations & Refunds:

To cancel an order, reply to the confirmation email you received when you placed your order online. Just tell us why you need to cancel and we will process it as soon as we can.  All orders canceled after 48 hours are subject to a $50 administration fee, regardless of whether your order has shipped.  If you order has shipped, you will also be responsible for return shipping charges. Refunds will be issued to the credit card that you used when placing your order minus a 10% restocking fee.*

How do I return a product?

If you want to return an item, please send an email to

Returns will only be accepted within 30 days** of the receipt of your product.  The product must be returned unused in the original packaging.

We do not accept returns of used products.  You should also provide us with a receipt of your purchase and a reason for returning the item.

Please note that you cannot return an item without a valid return authorization number.

You (the customer) are responsible for return shipping to the address given at the time you receive your RMA. In addition, there will be a 10% restocking fee on all returned products.

Upon receiving and inspecting the returned product, will issue a refund for the full amount (minus restocking fees) to the credit card used for the purchase only.

Custom Orders

Unfortunately, we are unable to accept returns for custom ordered products (made through a custom invoice) due to the nature of these specially ordered products. 

 * A 20% re-stocking fee will be applied for all Aqua2Use and Dry Flush products

** For all Emergency Water Well products, the item must be returned within 10 days for receiving the product. All other conditions above apply. 

Questions & Answers

Have a Question?

Ask a Question
  • How many watts or amps power the fan

    This fan draws .6 watts.

  • Does the vent fan need to run continuously? Does need to be vented to the outside of my house through the wall?

    Yes, it does. Yes it needs to be vented outside your home. It's important to keep your fan running for the solid waste to dry out.

  • Your toilets can they be adapted on a boat?

    Yes the Sun-Mar GTG can go on a boat. You just need to make sure you have venting and electricity.

  • Does it meet NSF standard?

    The Sun-Mar GTG is not NSF Certified.

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Customer Reviews

Based on 7 reviews
Phillip Schruben
New Toilet

It is so nice to have this unit in my shop. I cannot add another water flush toilet to my property so this unit is working out great for shop use. However even as I explained to all that visits my shop and uses the toilet that they need to sit down to use it some still haven't creating a mess by standing to pee. That is when I found out the biodegradable bags leak when exposed to too much moisture and that the 6 gallon size bags do not fit very well. I have installed signs advising people to sit to use.

Carol Smith
Never again

My experience with the company was awful.It took 4 months to receive my order and I sent 4 emails and called for months and couldn’t get anyone on the phone.I finally threatened through email I was filling a dispute and received it the next week.

Cheryl W.
Loved it

It worked as stated. Perfectly

george Davenport
Working it

Have not got it in yet

Joe W.
Composting toilet

Nice, and works great

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