I purchased this for deodorizing and disinfecting the garden after my pet entered the care phase and started using the garden as a toilet more often. However, my pet has passed away. I have some left over, and I hope someone can use it. It can also be used during walks! This is a set of three bottles. Purchased in April 2025. There is no specific expiration date listed. The following is quoted from the purchase site: Bacterin is a 100% natural deodorizer made by specially culturing EM bacteria. Zero chemicals! This is a deodorizer specifically for pets that doesn't just mask odors. Bacterin's deodorizing mechanism activates beneficial bacteria with EM bacteria, suppressing the growth of odor-causing bacteria. Odor-causing bacteria that cannot reproduce will eventually die. It helps and increases good bacteria, and eliminates bad bacteria – this is the Bacterin method! Made only with natural ingredients. ● Contains no chemicals. ● Safe and harmless even when sprayed in the garden where pets run around. ● One liter can be diluted for use. ● Also suitable for odor control other than for pets. ￣ ￣ ￣ ￣ ￣ ￣ ￣ ￣ ￣ ￣ ￣ ￣ ￣ ￣ ￣ ￣ ☆ For spray odors from stray cats! ☆ For homes where the garden is used as a dog's toilet! ☆ For cleaning outdoor dog houses! ☆ Dilute with water and carry it with you as a courtesy during walks! ☆ For odor control in garbage disposal areas! ☆ For cleaning drains! ☆ For deodorizing disposers and food waste disposers! This product (Bacterin / Outdoor Dilution Type) is a dark brown liquid. Please refrain from spraying on items where the liquid color may stain. ————————————————————————————————— [Living Deodorizer Bacterin] Outdoor Use, Colored Dilution Type, 1L Bottle Contents: 1L Size per bottle (cm): 9x9x25 Weight: 1.12kg Ingredients: Liquid/Weakly alkaline, EM bacteria Country of Origin: Japan Seller: Sunmate Co., Ltd.