An Upgrade that you will soon need in order to be compliant with the DEFO requirements.
The main feature is that it incorporates a built-in filter to reduce the heavy metals and fine elements that are washed out of the standard tanks and so making them eco-friendlier by preventing the pollution of the water table by the heavy metals which would normally be emptied from a standard Septic Tank.
A lot of people have to upgrade their septic tanks to accommodate current Spanish and EC legislation in order to be compliant with the DEFO requirements. This is an upgrade from the existing specification and requirements and we believe this type of filtrations will be mandatory in the future.