Humboldt Nutrients Structural Integrity (S.I.) is a silicate supplement designed for use with hydroponics systems but can be used with soil. 

Silicates provide the raw materials your plants need to build strong, thick cell walls and cellular membranes.

When adequate silicates are available, plants can produce larger stronger stalks and stems, giving them the ability to hold heavier fruits and flowers.

You can use it as an nutrient additive or apply as a foliar spray. Expect to see a larger, more robust harvest when you add S.I. to your regular fertilizer program.

Application rate:

Hydroponics - use 1-3 mL per gallon of nutrient solution. Change nutrient solution weekly to avoid excess sediment.

Soil - use 1-3 mL per gallon of water every 1-2 weeks.

Foliar Application - use 1-3 mL per gallon of spray solution.