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STS – Silver Thiosulfate Bottle 32oz (Commercial Size)


1 in stock

1 Bottle Makes a Gallon


1 in stock


This BIG STS Spray contains enough Silver Thiosulfate (STS) to make 1 Gallon of STS spray. Enough STS spray to sex reverse 100 small plant and perfect to make  a few thousand seeds as a commercial grower!

Just add water to the STS solution in the STS spray bottle and you’re ready to begin!

Included in this 1 oz Silver Thiosulfate Spray (STS) Spray Kit:

STS Spray bottle with Concentrated STS
Pollen collection jar
Syringe for measuring
Detailed STS Spray Kit instructions

What is Cannabinology STS Spray Kit?

The Cannabinology STS Spray Kit is designed with the grower in mind. The kit contains everything you need to sex reverse female plants and produce feminized seeds at home or in a commercial setting. Our proprietary Silver Thiosulfate formula provides the extended shelf life of a 2 part STS kit with the ease of use, accuracy, and repeatability of a premixed STS spray.

What is STS?

STS stands for Silver Thiosulfate, a compound produced by a chemical reaction between Silver Nitrate and Sodium Thiosulfate. When applied to plants, Silver Thiosulfate (STS) acts as an ethylene blocker. Ethylene can be considered the female hormone in plants. By preventing the action of ethylene you can force a female plant to develop and produce male-type flowers, pollen sacks, and pollen. Since this pollen was made by a female, the pollen can be used to pollinate another female plant creating feminized seeds which will be 100% female.

How does STS work?

STS is a compound that blocks the action of ethylene, the “female hormone” in many species of plants. When you apply the Silver Thiosulfate (STS) spray, the plants absorb the compound through their leaves or flowers where it blocks the action of ethylene. This causes the plant to grow and develop as if it were male. As the flowers develop, a plant treated with Silver Thiosulfate (STS) will develop male type flowers, pollen sacks and pollen rather than calyxes and pistils. The pollen that is released will carry only the genes for female plants.

How to Make STS:

The Cannabinology STS Spray has been formulated over years of research to be the easiest Silver Thiosulfate (STS) spray on the market while maintaining significant shelf life. Most Silver Thiosulfate sprays come in 2 parts to prevent the solution from expiring, but this also increases the opportunity for human error, especially for newer breeders. Other sprays come ready to spray right out of the box which unfortunately decreases the shelf life of Silver Thiosulfate solutions.
Our Silver Thiosulfate (STS) spray is designed to prevent human error while maintaining the integrity of the Silver Thiosulfate (STS) compound. All you need to do is add water and a touch of soap to the Cannabinology Silver Thiosulfate (STS) spray bottle and you’re ready to begin!

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