If it gets clogged and causes issues with the drain, it could easily cause overflowing. I would prefer somewhere in the sump before there unless you diligent on making sure its not clogging the return. I had a media basket I put mine in so the water had to flow through it. Of the two options, I like putting it in the baffle better, for the safety of it. you can also throw it into a reactor with carbon or GFO, etc.