【Limited-time price reduction today】 Power Bio product to prevent toilet odor, effective for approximately 4 months. - Product Name: Power Bio for Toilet Stains and Odor - Duration of Effect: Approximately 4 months - Thank you for looking. I had stocked up on these but no longer need them, so I am selling them. I still have plenty in stock, so please feel free to inquire. ◎Please understand that these are stored at home. ◎The shipping method will be Yu-Packet Post mini or Yu-Packet Post. Please purchase with the understanding that the box may be crushed during shipping.