A Perfect Lid for a Perfect FitThis special lid is designed to precisely fit a range of Reef Octopus protein skimmers with the intent to use it in conjunction with a CO2 Scrubber (RO-C2T-90) to draw out the moisture from the skimmer and increases the longevity of the CO2-absorbing media. Users will experience a more direct and cost-effective way of controlling the pH in their aquarium.Using this closed-loop system in managing pH will extend the longevity of the media compared to a non-closed-loop system. It can also be used as a lid for Ozone use when used in conjunction with a media reactor with granular activated carbon.