My mid-week project this week was building a Sawdust composting toilet
The parts required for this project
(all parts from Home Depot unless otherwise noted):
- Plywood (three 3×3 sheets @ $4 each from local Amish)
- Round toilet seat ($6)
- Two sets of door hinges ($2.50)
- Two buckets ($2.50)
- 2×4 scrap approximately 2 feet long
- 1×2 pine approximately 2 feet long
The total cost for the project is about $30.
- Circular saw
- Jig saw
- Miter saw
- Kreg Jig : Kreg R3 Jr. Pocket Hole Jig System (this is the newest version of my setup)
- Kreg face clamp : Kreg KHC-PREMIUM Face Clamp
I used about 40 inch and a quarter Kreg screws from a set like this one : Kreg SK03 Pocket-Hole Screw Kit in 5 Sizes
All that I have left to do is paint the inside, sand and add a handle to the sawdust portal, install the t&amp;g pine to the front and apply polyurethane to everything.
To use a composting toilet you need filler (sawdust, shavings, peat, etc). We get our sawdust from local sawmills who give it away.
You use the toilet like a regular toilet. Put down a a couple of inches of filler before first use then after making a deposit add filler to cover things. Once the bucket is 3/4 full we empty the bucket into a composting area that is away from water sources and cover that with straw to full decompose.
Alternatively you can use a trash bag as a liner. Fill the bucket like above with sawdust for odor but when full seal the bag (maybe double bag) and dispose of in the trash.
After we empty the buckets I wash the buckets with water several times and then clean with a bleach mix and allow to air dry.
I put black electrical tape on the handles of the buckets that are used for deposits and only use them for that.
- Loveable Loo (exspensive)
- The Cabin Can (less expensive and nicer looking)
- Reliance Products Luggable Loo Portable 5 Gallon Toilet
- This is the simplest alternative. If you kept another 5 gallon bucket fill sawdust you could use that as filler.
- Emergency Zone Honey Bucket Portable Toilet Seat Cover, Fits Standard 5 Gallon Pails
- Reliance Products Hassock Portable Lightweight Self-Contained Toilet
- We actually have one of these and used it before we had the composting toilet. You need bags that you seal up once filled and can dispose of in the trash.
- Reliance Products Double Doodie Toilet Waste Bags (6-Pack)
- Walmart also stocks these for the same price as amazon. Check the camping section.
There are a number of full composting toilets that I looked at but they were very expensive (north of $1k) and out of my price range. As I have never used them I am not qualified to talk about them.
One thought on “DIY Building a Composting Sawdust Toilet”
What are the dimensions of the box?