If the water has so much lime concentration as here in the Algarve, it might be advisable to install a water softener.
Also it might be important to use some acid products to clean through the possible incrustations.

Just gave EcoRain a ring and asked for some additional information.
They gave me the contact of a supplier company called Vital Gardens which is located in the Algarve aswell.
Tel.: 933 746 345