USA Plumbing & Sewer Inc provides the following services:

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Is Poo Pourri Bad for Plumbing?

No, Poo Pourri will not affect your plumbing at all as far as we can tell. Whether you have a septic tank or sewer system, Poo Pourri doesn’t seem to be bad for your plumbing. To our knowledge we have never been called in to repair or replace any component of a home plumbing system that was caused by Poo Pourri. From the information on their website, Poo Pourri seems to be made of essential oils and other ingredients that typically found in natural shampoos and conditioners. Since these do not typically cause clogs or other plumbing issues, they are considered safe. 

Additional resources:
How to Clean Out a Drain
How to Unclog Your Toilet
Can You put Dishwasher Detergent in Your Toilet?
Should You Use Bleach in Your Toilet?