NatSol directors Andy Warren and Nick Grant have 50 years combined experience in compost toilet design. They set up NatSol in 2005 to manufacture the waterless toilet that they wanted to be able to specify for their projects but couldn’t.
NatSol is widely regarded as manufacturing the best composting and waterless toilets on the UK market.
Why we are the UK market leaders:
- Proven performance with over 500 installations, view map.
- High quality materials and components.
- Spacious buildings with excellent accessibility for wheelchair users.
- Physically robust design with no pumps, fans or raking mechanisms to fail.
- Biologically robust twin-vault urine-separating design.
- Designed for the UK climate with no reliance on urine evaporation.
- Excellent service and after sales support.
- Detailed installation and operating guides.
Advantages of NatSol toilets
The Full Access Composter
This toilet has two vaults, each one being used for a period of a year. This is the preferred approach for self build enthusiasts but uncommon in commercial designs. It is a very robust system physically and biologically and avoids the need to remove compost that is mixed with fresh deposits. It is also urine separating.
Urine separation — why and how?
Urine is the biggest challenge for compost toilets due to the ammonia it produces and the sheer volume of liquid that must be evaporated or drained. We have not found evaporation to be reliable in the UK climate except for very low-use situations. Draining urine from the base of the vault typically requires the chamber to be out of the ground, making level access difficult, unless a pump is used. By diverting urine to a shallow soak-away we prevent it from entering the compost pile.
Our unique stainless steel urine diverting pedestal is common to almost all our toilets and is the result of many years of development. Typically other urine separators use a small bowl at the front of the pedestal. Unfortunately these are prone to blocking by loo paper and worse. The NatSol pedestal utilises the Coandǎ effect, the tendency of fluids to adhere to a smooth surface. You can read about how we developed the NatSol urine separator here.
Odour in use is actually less than for a conventional toilet. Whilst enthusiasts might tolerate a fusty odour we believe that correctly designed and operated compost toilets should not smell at all, indeed less than conventional toilets in use. For most installations we achieve this without the use of a fan which means higher reliability and no electrician required for installation. The urinal is also odourless and vented and avoids the use of a troublesome trap.
The combination of urine separation and generous twin chambers means that the Full Access toilet can handle peak uses such as open days, parties or church weddings. The capacity for continuous use is around 6 full time resident users or an average of about 25 daily visits. We have single toilets serving 200 plot allotments but please contact us to confirm capacity for your application.
The Compact, and a new Zero Discharge toilet
We also have a design for low use private situations, the Compact, and for high use public toilets with no discharge of urine to ground – such as those installed at Richmond Park. Find more details on the Products page.
The Environment Agency; The Royal Parks; The National Trust; Thames Water; Groundwork; The Forestry Commission; Natural England.
Our products are the preferred choice of the The Centre for Alternative Technology where they have been testing compost toilets to destruction since 1973.
Click here to view a page of testimonials.