  In this study we explore the diagnostic potential of the chromospheric Ca II
line at 8542A for studying the magnetic and dynamic properties of solar
filaments. We have acquired high spatial resolution spectropolarimetric
observations in the Ca II 8542A line using the CRISP instrument at the Swedish
1-m Solar Telescope. We use the NICOLE inversion code to infer physical
properties from observations of a solar filament. We discuss the validity of
the results due to the assumption of hydrostatic equilibrium. We have used
observations from other telescopes such as CHROTEL and SDO, in order to study
large scale dynamics and the long term evolution of the filament. We show that
the Ca II 8542A line encodes information of the temperature, line-of-sight
velocity and magnetic field vector from the region where the filament is
located. The current noise level only allow us to estimate an upper limit of
260G for the total magnetic field of the filament. Our study also reveals that
if we only consider information from the aforementioned spectral line, the
geometric height, the temperature and the density can be degenerated parameters
outside the hydrostatic equilibrium approach.
