DIY magnetic Kalk stirrer 

Magnetic stirrers are one of the simplest ways to build a DIY Kalk stirrer. I used an old reactor with a missing lid for the tube. You could also just use PVC or an acrylic tube.  For the used a hole saw and made a hole in the centre of a square of acrylic and bonded it to the tube. I sandwiches some rubber beteeeen a second price and drilled holes for nylon wing nuts   The rubber in the middle seals the lid
The base is a square of acrylic to hold a 120mm PC fan.  I did have to shave a few mm off the side of the fan to make it fit.  I glued a rare earth magnet to the centr of the fan and aligned it a few mm below the top of the frame to ensure it can spin freely

Inside the reactor be sure to put a piece of glass on the bottom to prevent the internal stir bar from wearing through the acrylic over time


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