An efficient recovery of the active spore-crystal complex of Bacillus thuringiensis was achieved by using either a disk-stack centrifuge or a rotary vacuum filter. In both operations the spore recovery efficiency was higher than 99%. Nevertheless, the concentration of dry solids produced by each method strongly differed, being 31.5% for filtration and 7.5% for centrifugation, while the organic solids concentration increased 9.2 and 2.5 times, respectively. Adjustment of the broth to pH 4 improved the solid-liquid separation efficiency.