In a specialized company like DRACE medioambiente it is very important to get feedback on the practical aspects of the work carried out. Successful solutions and new construction processes can be applied in other jobs and save production or operation costs. Avant-guarde technologies and research are not the only source of know-how; experience and simple ideas also consolidate a company in the market. Here is an example:a new idea for removing the roof scaffolding through a hole in the upper part of the dome of the digester was developed at the wastewater treatment plant in Alzira. The hole was specially prepared for this purpose and was later closed and sealed. With the traditional method, this is a highly dangerous and very costly process as the elements are dismounted one by one in a tight quarters more than 10 meters above the floor and removed through a small manhole.