Scouts purify river water for camp-outs.  GrouPeru! has our water purified when we go on mission trips each year.  The most important purification is that of Jesus' blood purifying us from every sin.  "But if we walk in the light, as he is in the light, we have fellowship with one anther, and the blood of Jesus, his Son, purifies us from all sin." - 1 John 1:8. - Pastor Mike