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This paper discusses an environmental criterion rarely addressed in the literature for
the selection of salt hydrates for use in photovoltaic installations as Phase change
materials . The aim of the paper is to assess the possibility of utilization of used salt
hydrates from photovoltaic installations according to current Polish legal requirements
concerning the environment. The properties of the composition components of
hydrated salts were discussed in terms of their safety for the environment before and
after the period of exploitation in photovoltaic panels. A method of dealing with used
salt hydrates was proposed and a waste code was assigned. It has been established
that spent salt hydrates will be allowed to be collected in no-outflow tanks and
accepted at liquid waste collection points, which operate at water supply and sewerage
companies, and the load of permissible pollutants should not exceed the value for
industrial sewage.