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This material is also not just an algaecide. It is used to kill bacteria and mollusks as well, and Buckamn states:
"Do not discharge effluent containing this product to sewer systems without previously notifying the local sewage treatment plant authority. For guidance contact your State Water Board or Regional Office of the EPA."
That certainly seems 100% clear to me that folks should NOT perform a water change and send the effluent into a sewer, no matter how convenient it may seem, without checking locally. Is a water change with it illegal? I cannot say, not being a lawyer or knowing if any material even remains in the water after use. The term "might" comes to mind. lol
This is like peeing in the ocean and people in Italy claiming you are messing with their water supply.





