Wanted 2 part doser

[.AcroKiller.]

I have a koralen calcium reactor setup with bottle and regulator that I will like to trade for a 2 part doser also I have arm extra corse media and coarse.

 

[greg0385]

What is the calcium reactor missing to be plug n play?

Sent from my ZTE-Z990G using Tapatalk 2

 

[.AcroKiller.]

Co2