Composting toilets require addition of carbon-based materials to the compost pile to ensure composting takes place. Different systems require different bulking agents for optimum performance. Commonly used bulking agents are:
All composting toilets require a layer of bulking agent at the bottom of the composting chamber to start the system (usually 50mm). Once in use, bulking agent is added in one of the following ways, depending on the system:
It is important to use the right bulking agent and in the right amount to get the best out of your system. Below are the recommended bulking agents and dosing guides for our systems.
All-in-one (AIO) systems with leachate drain
Bulking Agent: CM2 Mix or make your own mix with coco peat and wood shavings
Dosing Class: Dose per use
Bulking Agent: Nature Mix or make your own mix with coco peat and wood shavings
Dosing Class: Dose per use
All-in-one bucket systems
Bulking Agent: Bambooloo Mix or make your own mix with coco peat and wood shavings
Dosing Class: Cover it up
Urine diversion systems (UD-S and UD-C)
Bulking Agent: Fine, wet cover material - ideally coco peat or peat moss, otherwise sawdust
Dosing Class: Scoop per poop
Zero leachate, automatic, heated CHP systems
Bulking Agent: Eco Mix or make your own mix with 30% coco peat, 30% peat moss and 40% wood shavings
Dosing Class: Top it up
Mechanical heated and Mechanical non-heated CHP systems
Bulking Agent: Sun Mix Green or make your own bio-active mix (60% wood shavings blended with a range other organics and water, composted over 3 months)
Dosing Class: Scheduled AND Scoop per poop
Batching Processor (BP) Systems
Bulking Agent: Standard wood shavings
Dosing Class: Scoop per poop
Bulking Agent: GAP10 wood shavings
Dosing Class: Scoop per poop
Continuous Processor (CP) Systems
Bulking Agent: GAP20 wood shavings
Dosing Class: Scoop per poop
Mechanical, heated and Mechanical non-heated CHP systems
Bulking Agent: Sun Mix Green or make your own bio-active mix (60% wood shavings blended with a range other organics and water, composted over 3 months)
Dosing Class: Scheduled AND Scoop per poop
Mechanical, heated and Mechanical non-heated CHP systems with micro flush
Bulking Agent: Sun Mix Blue or make your own bio-active mix (60% coarse wood shavings blended with a range other organics, 10% bio-char and water, composted over 3 months)
Dosing Class: Scheduled
Solar Desecration Drying (SDD) Systems
No bulking agent required.
Additive: Kazuba Dry
Dosing Class: Scheduled (commercial spec)
Need help choosing a system? Call WCTNZ® on 0800 022 027 for free advice on system specification and setup. Advanced design consultancy services are also available.
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