CO2 Scrubber for Reef Octopus (closed loop)

9/15/23 Updated cap with float switch holder.
Closed loop CO2 scrubber for a Reef Octopus 202S skimmer. May fit other models. I use a BRS GFO reactor (https://www.bulkreefsupply.com/brs-gfo-carbon-reactor-single.html) for the media but you can use any reactor you want. I created 1/2" NPT to 5/8" ID hose fittings to attach the lines. The inlet on the skimmer is 1/2" so I simply used a piece of 1/2" ID hose as a step down. Also added a mount to attach the reactor to the sump and plugs for the skimmer lid. Added a catch-can that uses standard specimen cups.