Secondary chamber for geo 612 calcium reactor

[LittleMaui]

I would like to add a secondary chamber to my Geo 612 calcium reactor. However they're quite expensive to buy a Geo brand. Does anyone have any pictures and recommendations of an alternate that can be used?

 

[Water Dog]

Use any reactor that you have laying around and change the plumbing/fittings to accept John Guest 1/4” RO tubing. Fill with Caribsea ARM fine media and you should be good to go!

 

[MJNTWise]

This is what I did