This unblockable VGB main drain distracts from some pebble tec projects however with the amount of surrounding trees, its the only drain on the market that will allow debris to be collected. An extra leaf catcher and two high flow venturi skimmers were also installed. A HUGE difference for ease of maintenance for the homeowner. There are smaller VGB drain covers that are clear and can be filled with the Pebble Tec product however they are unable to filter debris. Since this project, the manuf. (A&A Manuf.) has come out with a pebble fill-able trench drain. This project was done when I worked for a former pool co. Since starting Vue Custom Pools, this client has remained one of my best referral sources.