Glycerophosphoryl diester phosphodiesterase hydrolyzes deacylated phospholipids to sn-glycerol 3-phosphate (G3P) and the corresponding alcohols. a sn-glycero-3-phosphodiester + H2O = an alcohol + H(+) + sn-glycerol 3-phosphate Binds 1 Ca(2+) ion per subunit. Belongs to the glycerophosphoryl diester phosphodiesterase family.