Highly selective xylulose-1,5-bisphosphate (XuBP) phosphatase. Shows also activity towards ribulose-1,5-bisphosphate (RuBP) and fructose-1,6-bisphosphate (FBP), but not towards fructose-6-phosphate (F6P) or ribulose-5-phosphate (Ru5P) (PubMed:27246049). Degrades xylulose-1,5-bisphosphate, a potent inhibitor of rubisco produced by the rubisco itself (PubMed:27246049). D-xylulose 1,5-bisphosphate + H2O = D-xylulose 5-phosphate + phosphate kcat is 2.45 sec(-1) with xylulose-1,5-bisphosphate as substrate. kcat is 0.049 sec(-1) with ribulose-1,5-bisphosphate as substrate. Belongs to the HAD-like hydrolase superfamily. DOG/GPP family. The predicted gene has been split into 2 genes: At3g48420 and At3g48425.