Calcium reactor recomendations

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I have a Barr Aquatics calcium reactor I got from Austin Oceans.

They do have thumbscrews on the top for refilling, I don't see the issue there, you refill the media maybe every 6 months give or take?

It is the only Ca reactor I have ever had but IMO it is absolutely excellent.

Lots of great features. Dual recirc design. Built-in flow meter. Built-in bubble counter. Port for pH probe. Can be run either with no feed pump or from a Maxijet or teed off the return line. It has a very compact design. Overall it has been very easy to use and I recommend this calcium reactor 100%.