- Joined
- Aug 19, 2017
- Messages
- 142
- Reaction score
- 115
ive noticed after I got my dos hooked up and running that slowing there’s been this layer on water surface in return section of sump. Can dosing cause this or could it be another problem. But it is only the return section cause it’s the only section with no movement. But it was never like like before I started using the dos, that’s why I think it could be from that



