Silver Thiosulfate TWO PART Solution, 1 Liter, used to produce male flowers with female pollen to be used in producing feminized seeds. This two part solution when mixed together makes 1 liter of Silver Thiosulfate Solution. This is enough to feminize a full 4 x 4 grow tent that can produce thousands of feminized seeds. The shelf life of this product is six months unmixed, and 6 weeks after mixed. Store in refrigerator for best shelf life. Easy to use. Mix part A into part B then add 900ml of distilled water to create a Liter of STS. Instructions are included with the product. UV protected chemical resistant spray bottle and pipette are included.