Having down sized to a nano for a little while, I'm no longer using this. It works great with a top off system and a controller. The maxi jet pump kicks on periodically to keep kalk in solution. Includes the reservoir in the picture... I put the reactor inside it to avoid messes. Top off water also goes in the reservoir and is pumped through the reactor when your top off system calls for make up water.
$50
I can bring it to the swap on Sunday if someone wants it.
DIY kalk reactor
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