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Natsol Compact Waterless Composting Toilet

Natsol Compact Composting Toilet

A composting composting toilet. Designed for smaller spaces or lower use applications. British design. Read More

Please see below for more information or contact us

£1,131.00 inc VAT

£942.50 ex VAT
In stock

All prices include VAT where applicable

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  • Description
  • Installation
  • Q & A
  • How it does the job
  • Delivery and Returns

The Compact was developed as a smaller and more economical solution for applications where the Full Access toilet is more than required. The perfect toilet for a summer house, garden studio or other fairly low use situation with familiar users.

This toilet is urine separating and can have either a fan driven or passive vent depending on circumstances. Wood shavings, or similar material, are added to the toilet after “number twos” and these solids are eventually emptied into an outdoor dedicated composting chamber to complete composting. If you have ever had to empty a wet chemical toilet you will find this much nicer to deal with.

NatSol composting toilets are ideally suited to a wide range of applications from garden offices and studios to campsites and busy allotments.


  • Below floor base box with removable trug and biodegradable liners; 
  • Stainless steel pedestal, seat and lid; 
  • Vent cowl (and fan unit and power supply if required); 
  • Back inlet gully for urine soakaway; 
  • Some 110mm connections

Optional extras:

  • Gel dispensers; 
  • Ceramic waterless urinal; 
  • Grab rails; 
  • Soak bin

Not usually supplied:

  • Soil pipe to connect toilet to soakaway; 
  • Vent pipe; 
  • Building

These toilets are made in the UK and designed to work in the British climate.  

For more guidance, Glossary of Terms, Inspiration & Advice and other information, please browse our website or feel free to Contact Us


Our products and solutions are no different from any other appliance buy or home/ office improvement you make.

To help makes things easier for you, we've given a guideline on the approximate skill-level and time involved in the installation of this product:

Professional: general builder and mate; 2-3 days

Please note: some of you might think you're handier than you are! This is a guideline only, intended only to help you understand how simple installation is and whom you could ask to do it for you. If you were unsure, we would recommend getting the professionals in!

All your questions should be answered here.  Even more information may be found on our factsheet and glossary pages.  

If you need further advice, then please get in touch.

  1. Do I need planning or building control approval?
  2. How is the finished compost emptied and what can be done with it?
  3. Does it take much time to manage a NatSol compost toilet?    
  4. Are flies a problem with composting toilets?  
  5. Why not get rid of the urine by evaporation?
  6. Why urine separation?
  7. Does anything have to be added to the toilet?
  8. How is the toilet ventilated?


1. Do I need planning or building control approval?

It is often necessary to have planning and building control approval from the local authority before installing composting toilets. Although the responsibility for acquiring these consents rests with you, the client, we are happy to assist in acquiring them and have considerable experience in so doing. No local authority has so far refused. Representatives from the Building Research Establishment inspected several NatSol toilets to assist them in eventually determining appropriate standards and regulations for composting toilet installations.


2. How is the finished compost emptied and what can be done with it?

For our “in-ground” toilets we supply a custom made shovel for emptying the compost through one of the front floor hatches. A small layer of compost is left in the bottom to supply decomposing organisms for the next cycle. If the management instructions have been followed and if the resting vault has been left for a minimum one year period the compost should be odourless, friable and pleasant enough to remove. The compost should be used or disposed of in accordance with Environment Agency and/or Local Authority guidelines or, in the absence of any official advice, further composting can be carried out in a dedicated composting facility on site before eventual use or disposal. You should not assume that it is completely free of disease causing organisms. Some human parasite eggs can survive for many years in compost and although these are generally only found in tropical or sub-tropical populations we advise against using finished compost on food crops. We will provide further advice if you purchase one of our toilets.


3. Does it take much time to manage a NatSol compost toilet?

Really very little, but it is important to remember to check certain things on a regular basis. A set of management instructions will be provided with every installation.

4. Are flies a problem with composting toilets?

We would be suspicious of any manufacturer of a genuine composting toilet who claimed they had never had flies in one of their composting toilets. There are a large number of dung fly species in the UK and due to their small size they can fairly easily find their way into a toilet vault. However, we are pleased to report that a recent survey of our toilets did not reveal any problems with flies. Our research has also demonstrated that should they occur the problem can be resolved by a change in the management regime. The most likely cause is due to high moisture content in the vault and this may be caused by failure to clean the urine separating system. To a large extent fly larvae will be eaten by other small predators in the compost pile. However, we cannot completely guarantee fly free performance due to the complex nature of composting processes. Dung flies are not likely to act as disease vectors because they are not usually attracted to food.


5. Why not get rid of the urine by evaporation?

In the relatively cool and wet UK climate getting rid of urine by evaporation is likely to be very unreliable. Another reasons is that wet systems can be more prone to infection with certain species of insect such as drone flies.


6. Why urine separation?

Urine from seated users is diverted away from the compost pile. This is beneficial as it reduces the amount of “soak” material required and makes it possible to reduce vault size. Vault drainage is not required and the risk of ammonia smells is virtually eliminated. A ceramic wall mounted urinal is usually provided for men. Urine is a very useful fertiliser since it contains an almost perfect balance of plant nutrients. Subject to any statutory requirements we usually advise on disposal of urine to ground where some of the useful nutrients can be made use of by plants.


7. Does anything have to be added to the toilet?

Whenever the toilet is used for defecation a small amount of “soak” material, usually wood-shavings, is added to the vault. Alternatively a suitable amount can be added at the end of the day by a manager. The purpose of soak is to

  • maintain an open structure so as to prevent the pile becoming anaerobic,   
  • soak up excess moisture,   
  • adjust the carbon-nitrogen ratio by adding more carbon,    
  • cover the wastes. We will advise on a suitable soak     material for the type of toilet you decide to purchase.     


8. How is the toilet ventilated?

Ventilation takes place down the toilet pedestal. This removes odours at source. Consequently, our toilet cubicles can be expected to smell less than WC cubicles. Most of our toilets are passively vented but in the case of fully enclosed cubicles in buildings which have other functions as well we recommend fan driven ventilation using a 1W fan. This supplies the cubicle ventilation required under building regulations. With remote toilets on, for instance, allotment sites we have never known a case where passive ventilation was not wholly adequate.

Here are just some of the ways it does the job:


  • Eliminate the cost of running water to your toilets.

Better Consumption:

  • Reduce your water consumption;
  • Create your own compost.

Feel good:

  • Less odour than a conventional toilet
  • All the benefits of having a more natural toilet


  • No moving parts which means higher reliability and no electrician required for installation;
  • You use it just the same as an ordinary toliet


  • Robust;
  • By diverting urine to a shallow soakaway we prevent it from entering the compost pile- eliminating odours;
  • High capacity- The combination of urine separation and generous twin chambers means that the Compus Twin can handle peak uses such as open days, parties or church weddings. The capacity for continuous use is about 8 full time resident users or about 50 daily visits.

 And more:

  • [Blah, blah]


Here is a guide to delivery and returns.  We are constantly looking to minimise delivery costs so some products may vary.  All available delivery options will be shown in the basket and correct delivery will be calculated before you check out.  You will only be charged one delivery cost.   

Not all options available for all products.

To calculate accurate delivery cost to any address, please click ‘Estimate delivery cost’ above.  

International deliveries: Please call us for more information on international deliveries

Collection from ItDoesTheJob.com HQ available for some products. 

We think you’ll be more than happy with your purchase.  If you’re not, simply return to us within 30 days.  

Read more about Delivery and Returns