  We consider as a model of Weyl semimetal thermoelectric transport a
$(3+1)$-dimensional charged, relativistic and relaxed fluid with a $U(1)_{V}
\times U(1)_{A}$ chiral anomaly. We take into account all possible mixed
energy, momentum, electric and chiral charge relaxations, and discover which
are compatible with electric charge conservation, Onsager reciprocity and a
finite DC conductivity. We find that all relaxations respecting these
constraints necessarily render the system open and violate the second law of
thermodynamics. We then demonstrate how the relaxations we have found arise
from kinetic theory and a modified relaxation time approximation. Our results
lead to DC conductivities that differ from those found in the literature
opening the path to experimental verification.
