{TAIL ~ A water system} 15 selected from the group consisting of {HEAD ~ geothermal water}, water in central heating systems, and water for hydrostatic tests 
{ TAIL ~ A water system } 15 selected from the group consisting of { HEAD ~ geothermal water } , water in central heating systems , and water for hydrostatic tests
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH