a stable , low voc , low viscosity biocide formulation comprising an effective amount of at least one biocide , and a alkyl poly glycol liquid carrier of formula : r — o - n — h , wherein r is a c 1 - c 3 alkyl ; ao is an ethyleneoxide group , a propy - leneoxide group , a butyleneoxide group , or a block or random copolymer of two or more groups selected from an ethyleneoxide group , a propyleneoxide group , and a butyleneoxide group ; and n is the average number of repeating ao units and is at least 4 .