How My Composting Toilet ACTUALLY Works – A Review
I promised I would do a review on the composting toilet after it had been in use for a while. After 6 months I thought it was time for my first in depth review. Besides, I have had A LOT of questions recently on it. Warning, there are pictures into my potty at the bottom. When I was shopping for one I wanted to see what they looked like in the bowl and it was SO hard to find a picture. I never did. So there is a picture of what a composting toilet looks like down in the bowl.
You can read more about the toilet picking out and purchasing experience HERE, HERE and HERE. Suffice to say, I was not happy with the level of customer service from the get go. I am very happy to say that the technology (or lack there of) of the composting toilet is great. I love my potty!
I went into this project very leery of a composting toilet. With the same thoughts as many people have: It’s gross. The smell will be horrid. It will be disgusting, a maintenance nightmare etc. This entire project has been fundamentally about learning for me. The toilet was approximately 20% of my entire budget. Even though I had all of these concerns about functionality, I took the risk to find out about this option first hand.
This is my experience:
I like it way better than a flush toilet, honestly. There are NO smells at all. There is a fan that creates a constant vacuum of air going to the outside. It is warm when you use it. The unit I have has a small heater. No back splashing and no one can hear you peeing! All pros.
I have the added benefit of knowing that I am not contributing to a waste system where drinkable water is flushed. That is a lot of energy/chemical use which I get to bypass. Naturally and safely.
Like I said, I was very leery initially for the same reasons as many others. After six months I have had two issues and zero REAL issues. I will get to those in a moment. I have not yet had to empty the drawer. Based on full time occupancy – 3-4 persons – that would happen after about one year. Currently I am not even a quarter of the way to full. In spring I will do that drawer emptying deed, simply because it’s been enough time. I expect that it will be as painless as they say (pretty hands off and non-gross). Other than that, even as expensive as it is, it is cheaper than installing a septic system. And it is not as limiting when finding a location compared to having to hook up to sewer. It gives me more flexibility.
100% of people (I rounded up) do assume it’s gross and disgusting. Also that I am a weirdo for choosing that option. That is the one drawback. I do have a brother who refuses to use it. James did too, for a little while. He’s fine with it now. I wanted to have the most normal looking composting toilet so that it didn’t weird people out to use it. I think it does anyway though. Which I understand, it really is ok though!
The two issues:
The neighbor came over and one day when I was outside working and asked me when the toilet unit ‘cycled’ and if I could reset it for a different time. He and his wife like to hang out in their backyard in the hot tub late at night. It seemed to ‘come on’ when they were out there and ‘really stinks’. This was an odd question to me because there is no ‘cycling’ with this unit. There is a fan that runs constantly. It vents out really high so that it is not noticed. And it does a really good job of being not noticed. There is also a small heater in the unit that constantly runs. That is all. Completely passive outside of those two components.
It made no sense at all that it was perfectly fine all day except at this one time every night. I racked my brain on it for a while. Then I noticed that time of night was pretty close to the same time of night that I let Denny out to potty before bed. Turns out he had taken up the habit of pooping in the alley, pretty close to where their hot tub is. And they are right, he STINKS! It’s slightly embarrassing that they think I could smell like that. I don’t want to pretend that my poop doesn’t stink but seriously, it’s not Great Dane level! Once I figured out the issue I fixed it. The neighbors still think I poo nuclear poops though. I have that to think about every time I say hi to them! So, issue one is a non-issue…
Just the other night, maybe a week ago, it seemed like the vent stopped working. I have had the power go out before or have to be unplugged for a bit causing the fan to stop. It does start to smell in the house after a bit if I don’t seal off the toilet first. I.e. close the lid. I could still hear the fan running though. I completely couldn’t figure out what was going on. Of course it happened late on a Sunday night. After it was dark and when I couldn’t see to fix it. It couldn’t have happened when there was light when I could do something about it. Even still, it wasn’t horrible and I pretty much convinced myself it was in my head. Just my pregnant nose smelling weird things again. So I went to bed. In the morning I could still smell it.
I asked James if he could too. He did. But it wasn’t like when the fan goes all out. That is very noticeable, this was hard to tell. I went back around by the vent and I could hear water dripping in it. There was no reason that should have been happening. By noon on Monday it was just fine. I am not positive what happened but I THINK that snow may have fallen into the vent and partially blocked it. As the day warmed up, it melted away and everything was fine. I did decide I need to get up there and put a screen over the opening. I can see a bird or something making it’s way in the 2″ opening and nesting. So even issue two is a non issue. I’m fairly positive it was a weather issue, especially since it fixed itself with the warmer temps.
As you can read in the previous posts linked above, I chose to get a ‘fancy’ composting toilet (and paid the premium for it) so that I could have it in an urban area. It has passed special inspections (UL) to be ‘safe’ as far as health services are concerned. While this unit is not accepted everywhere it is much more so than say the standard humanuer version. In most cases where it is not readily accepted it is likely because the question has never been raised. Obviously a composting toilet is different than the standard flush unit in a few way. So, the ‘special’ things you have to do with my particular composting toilet. (I am not speaking for the humanuer versions, I don’t know much about them):
- When you first set up the toilet, after a week or so of use add the provided bacteria. There is a little packet of bacteria that the manufacturer sends with the unit. Put that packet in the tank. It’s as easy as opening a package of ramen and dumping it out. That’s it!
- At full time use: about twice a week rotate the handle. There is a handle on the exterior unit that needs to be cranked a full turn. I actually have grown to love this little activity. It feels like I am accomplishing an important bit of maintenance (and I am). It also helps me mark the week. I crank it on Wednesdays and Sundays. It’s really no big deal.
- There is no special toilet paper you have to use, it all breaks down.
- About 2-3 times a week throw in about a cup of compost mixture. We use a mixture of peat moss (40%) and Sawdust (60%). I have a ton of sawdust I saved from my build. I will be set for years on this!
- If the unit is below 55 degrees the bin acts as a holding tank only. Composting slows/stops. The weather does not hurt any of the components. It simply sits dormant until it warms up again. This is the reason I am waiting for spring to empty the drawer. I want to make sure it is in composting mode rather than just holding tank mode.
- To empty the drawer you first fill it. Cranking the handle in reverse will empty the main bin into the finishing drawer. Let it sit and ‘finish’ in the drawer for 6-8 weeks. At that point I hear it is just like potting soil and that I will not be grossed out to empty it into my compost bin OR directly onto my plants. I still don’t think I can use the compost on my veggies. I may have to stick to the flower bed. This happens a max of 4 times a year I expect I will be doing it once a year.
That’s it, it’s just different than a flush toilet. It hasn’t been gross in any ways [to me]. There are actually a lot more pros than there are cons [to me]. I would definitely suggest the unit to anyone else. It’s weird to talk about potties but I am totally fine with it if there are any questions that are left that I haven’t answered. Please, write them in a comment. I’m sure you aren’t the only one wondering. I’ll do my best to answer them!
One Last Thing
One important thing I haven’t really mentioned, because my unit does it automatically: A good composting toilet will have a urine separator which does exactly that, separates the urine. THAT is actually the stinky part of a toilet. If you can keep the solids and liquids separate the smells go WAY down. Urine will smell much faster and much stronger than poop.
The must haves of a hands-off composting toilet include:
- a urine separator of some sort
- a vent (preferably with a fan to make SURE the air-flow is going the right way – OUT)
- depending on your climate, a little heater to keep things above freezing and help evaporate off the liquids.
There are plenty of people who are good with the humanuer version. (i.e. 5 gallon bucket with sawdust. They sell urine separators for those too.) I just didn’t like the maintenance of those and the fact they would not be allowed in a city center because of health and safety regulations. For some they are a great and inexpensive option though. They certainly function the same way as my expensive toilet.
Now for the pictures inside the toilet
Turn away if you must (it’s really not that bad…)!