Come on people! i need to know as well!

There are several types of septic tank available.  Only the very large ones (for blocks of flats etc.) need powering.
The most common two here seem to be the multi-chamber Remosa ones (http://www.remosa.net/remosa/productos/prod_105.html) and the bell shaped ones.

Some people illegally just dig a hole in the ground then coveer it and feed a pipe in.

You'll need a hole for it (obviously!) and a trench for the input pipe and then a trench for the exit tube (which needs filling with stone chippings to not block the pipe which has perforations in it). The price for the hole depends on the soil/rock - one I was recently involved with cost 1200 euros for the hole as it took 19 hours to chip through the very hard rock in Aldover!

The Remosa tanks cost around 750 euros + IVA for a 1400 litre (4 person) tank and 1250 + IVA for a 2300 litre (7 person) tank.

I'm not sure about permissions but as you're not actually constructing anything, rather just burying something, then you may find you don't need permission (anyone know better??).

Nigel

Hi Jote,

There are a lot of instruction-films on Youtube about modern septic-tanks. A friend of mine installed a modern tank in Belgium, it used electricity to monitor the water level. Because it is a holiday house the tank won't be used for months and dry out whithout this water-monitoring system. If you really want an cheap and environmental friendly system: build a compost toilet.

Good luck,
Mark

why not make your own out of old cubos i no people who have