I recommend the Austin Oceans calcium reactor.
It is available from the U.S. however our dollar is worth more now.
The advantages of this reactor are:
Dual chamber upflow design
CO2 scavenging
Built-in CO2 bubble counter
Built-in flow meter
Feed pump not required
No connections through the acrylic tubing, only through the ends
Built-in port for pH monitor
I bought one a few months ago, it is easy to use.
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