Absolutely not! You could literally fill your waste water tanks with TankTechsRx and it wouldn’t harm a thing. Take a look at our ingredients list. TankTechsRx products are made from all-natural ingredients you can find in your kitchen and are perfectly safe for people, pets, and the environment. (However, our products are NOT manufactured for consumption, so please don’t ingest them.) You can rest assured that TankTechsRx products are the safest you can use to keep your holding tanks healthy.