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Caravan Built-In Toilet and Porta Potti

Discussing portable toilet systems for caravans and RV's including the best chemicals to use.

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Do your part by choosing environmentally friendly biodegradable chemicals and avoid products containing formaldehyde.

 

What are the different types of toilet systems for a caravan / motorhome?

 

        The Internal Cassette Type Toilet

The toilet consists of two parts: a permanently installed toilet and a waste tank that you can access and easily detach from outside. To prepare the toilet for use, you simply add toilet fluid to the waste tank. For models with an in-built water tank, you also need to fill the water tank.  The toilet is then ready for use. A level indicator shows when you have to empty the waste tank.  Then all you have to do is detach the waste tank and empty it in the nearest authorised waste dump. After that, you make the toilet ready for use again.

A small door on the outside of your caravan or motorhome gives you access to the detachable waste tank, making it much easier to prepare the tank for use from outside. It also makes it easier to empty and top up the waste tank hygienically.

The various models, with either rotating or fixed toilet bowls, blend in seamlessly with your bathroom, making the best use of the limited space.

 

                The Porta Potti

Because these toilets are compact, lightweight and easy to use, the porta potti is often used in caravans, motorhomes, boats and camper trailers. The porta potti is simple to transport and really can be placed anywhere.  It is small enough to pull out from under your caravan bed and slides neatly away again when not in use.

The porta potti consists of two sections. The upper section is a combined flush water tank and toilet bowl with detachable seat and cover. The lower section is the waste holding tank. These two parts are easy to attach and detach using a lever at the rear of the toilet. In this way, the waste holding tank can be simply and hygienically emptied and cleaned.  Most porta pottis are equipped with a level indicator. In this way you are warned in good time that the waste holding tank must be emptied.


 

Can I empty my porta potti / toilet cassette in septic toilets ?

Thetford Australia advises "Both Aqua Kem Green and Premium Aqua Kem Green can be disposed of into a septic system"

 

What chemicals should I use for my porta potti / toilet ?

Things to consider when assessing many of the different chemicals available for your caravan's toilet / porta potti are -

Does the chemical chosen

  • suppress unpleasant smells;
  • promote the breakdown of solids and toilet paper;
  • protect moving parts and extend the life span of your toilet / porta potti;
  • reduce formation of gas;
  • keep your waste tank hygienic and clean;
  • meet environmentally free standards ie: is it formaldehyde free?

 

Why should I choose formaldehyde free toilet chemicals ?

What is formaldehyde ?

It is defined as ‘a chemical used in manufacturing and chemical industries, and as a preservative by anatomists, embalmers, and pathologists. Being exposed to formaldehyde may increase the risk of developing leukaemia and brain cancer.’

Formaldehyde is toxic to animals, plants and humans and exposure may cause irritation to the eyes, throat and nose and can cause lung and skin allergies.  It is often used as an active ingredient in toilet chemicals to break down and sterilize the ‘black water’ or toilet waste.

Toilet waste containing the formaldehyde chemical is really only suitable for disposing of in septic toilets in the city where there is sufficient water and other wastes to break down or dilute the formaldehyde.  When travelling in regional or remote areas it is not suitable to dispose of in drop toilets, country town septic toilets or even buried in the bush.

Some regional towns have CMCA/ KEA sponsored ‘dump’ points however if your toilet cassette or ‘black water’ waste contains formaldehyde it should not be disposed of in those facilities as it can de-nature the waste breakdown.  There is also considerable cost for local shire councils to remedy the problem as they often lack the availability of sufficient water to dilute the waste solutions.

Some toilet products may also be formaldehyde free but unsuitable for recirculating toilets and holding tank models.

Vacuum Toilets

What is a vacuum toilet ?

A vacuum toilet is a toilet system developed for caravans and motor homes.  It comprises a toilet bowl from which extends a pipe to the cassette.  It operates similar to a toilet on an aircraft so when you flush, the vacuum in the line sucks the contents in the toilet bowl, using very little water, to the tank.  

One manufacturer, Dometic, supplies ceramic toilet bowls with a vacuum toilet for caravan, motorhomes and marine sailing and power craft.  The manufacturer claims the action of the vacuum breaks the waste down so no chemicals are required.  They promote the benefits as odour free, extremely low energy and water consumption, as well as allowing greater design flexibility due to the remote cassette installation.

The vacuum pump requires power to operate and if by chance your battery is flat it will not operate.

One point to consider though would be not to locate the remote cassette under your bed as the pump runs for about 60 seconds to reset the vacuum and this may be inconvenient, for the sleeping partner, if it is used during the night.

Another of the Dometic models has a holding tank system suitable for coaches and motorhomes.  These holding tanks are available, depending on the manufacture of your vehicle, in 35, 60 and 90 litre capacity. Dumping is at the push of a button with a small bore hose to a nearby dumping station.

Other articles that may interest you -

 


 
Heating
- Electrical Heaters
- Diesel and Gas Heaters
Internal Shower/Toilet Units & Porta Pottis
-
Getting rid of algae and maintenance
-
Home made portable toilet chemicals
Managing water
- Hoses - drinking and sullage

-
Water tanks and 12V pumps
-
Hot water systems
Refrigeration

 

 


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