WTB: GHL Maxi Doser or Ecotech Versa Doser

I have a Versa if interested. Used it for kalk for about 3 months. I also have 2 GHL 2.1 SA dosers.
 
One of the Versas I got doesn't work. Still need two more of these.
 

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WHICH REEFING SKILL WOULD YOU MOST LIKE TO DEVELOP FURTHER? (CHOOSE UP TO 3)

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