text: Desalting spin columns are widely available with various volumes and MWCO limits:
  * [http://www.piercenet.com/cat/desalting-columns Thermo Scientific Pierce Products]
  * [http://www.bio-rad.com/en-us/category/bio-spin-micro-bio-spin-size-exclusion-columns Bio-Rad Laboratories, Inc.]
  * [https://www.cytivalifesciences.com/en/us/shop/chromatography/prepacked-columns/desalting-and-buffer-exchange/ Cytiva ]