Hello. I recently setup a 90gl reef ready that I purchased used. The Durso Standpipe (overflow) has about a 1/2" air hole just below water line to stop siphon if required.
The return line back into the tank is a 1" PVC that goes to a 90 elbow and into the tank through loc-line connection, The 90' elbow has a small airhole located on the underside. It makes quite a bit of noise and I am wondering if I really need it since the overflow pipe into the sump has the siphon break hole. Is this hole in the return line a redundant backup in the case the overflow has an issue or is there a different purpose for it?
Thanks
The return line back into the tank is a 1" PVC that goes to a 90 elbow and into the tank through loc-line connection, The 90' elbow has a small airhole located on the underside. It makes quite a bit of noise and I am wondering if I really need it since the overflow pipe into the sump has the siphon break hole. Is this hole in the return line a redundant backup in the case the overflow has an issue or is there a different purpose for it?
Thanks