Floral Water Facial Spray: Preservation Needs & Ingredient Compatibility with Reservoir-Tech

Regarding Reservoir-Tech and whitening ingredients:
According to the staff's response, the specific whitening ingredients you mentioned (Tetrahydrocurcuminoids, resveratol, Oxyresveratrol, Lemon Peel Extract, Alpha Arbutin) have not been tested for compatibility with Reservoir-Tech. Therefore, it cannot be confirmed if they can be used effectively or if you will get the expected benefits when using them in a formula with Reservoir-Tech. However, water-soluble ingredients from other categories (not whitening) can be used normally with Reservoir-Tech.

Regarding rose water and lavender water as a base (80-100%):
Based on the staff's reply, you do not need to add an additional preservative if you use rose water or lavender water as the main base (80-100%), provided that the mixing process is clean and all equipment used is properly sterilized, for example, by spraying with alcohol before use.