Pre-filled container, method of use and related production method

A production method of a pre-filled or pre-fillable with one or more substances, comprising:

• a squeezable activation compartment for containing said substances;
• a dispensing compartment with a first portion having at least one dispensing member and a second portion fluid-dynamically connected to the activation compartment;
• an activator element inside a container, having a head with a tapered closing portion and a sliding crown larger than the tapered closing portion, the sliding crown provided with one or more mixing elements;
• wherein the activator element is movable between a closed position, hermetically isolating the activation compartment from the dispensing compartment, and an open position, allowing fluid-dynamic communication between the compartments for substance dispensing;
• wherein the production method comprising:
• comprising the following steps:
• increasing a temperature of said container for workability;
• inserting said activator element into said container;
• and
• centring and engaging said activator element between said activation compartment and said dispensing compartment
• wherein at least one of the activation compartments and the dispensing compartments are molded by a “Blow Fill Seal” process;
• and
• wherein the dispensing and activation compartments are formed and calibrated by inserting the activator element into the container.