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 Hi Mindy, right now im using Elis  soda ash.  i read  maybe the tubing can  cause problems  with restrictions  (something about the silicone line   and less friction?), do you use  air line  tubing im using the white  RO tubing  but do have it  feeding into the sump water.  Although the doser on my   nano is  dripping above  the tank and  gets build up.  so perhaps  the  chems?  both can crud up in a week . 
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 brent
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