TASK DEFINITION: Translate the given Spanish text to English
PROBLEM: ID.

SOLUTION: ID.

PROBLEM: The piston can prevent refilling of a syringe.

SOLUTION: El pistón puede evitar el relleno de una jeringuilla.

PROBLEM: The invention further includes a tank for storing purified water and maintaining it within a pollution-free environment.

SOLUTION:
Asi tambien utiliza al tinaco para resguardar agua ya purificada y la mantiene en un ambiente libre de contaminacion.