20X NPS


 * 1) Add to 400 mls milliQ water:
 * 2) * 22 g (NH4)2SO4
 * 3) * 68 g KH2PO4
 * 4) * 71 g Na2HPO4
 * 5) Bring volume up to 500 mls and mix to re-suspend. Filter sterilize.