Antifreeze solutions can be used for maintaining automatic sprinkler protection in small, unheated areas. Antifreeze solution
s
are recommended only for systems not exceeding 40 gal (151
L). Because of the cost of refilling the system or replenishing small
leaks, small, dry valves should be used where more than 40 gal (151 L) are to be supplied. Propylene glycol or other suitable
material
can be used as a substitute for priming water to p
revent evaporation of the priming fluid and thus reduce ice formation within the
system.