The Savior Return Flow Lines (3) Savior Return Flow Lines is just what you have been waiting for to control your water flow in your pool or Spa. Thanks to Michael Evingham from Natural Current he has given you the way to send your return water flow to needed problem areas where algae seem to grow. Also the ability to water surface river flow your water to the Skimmer. You can also tee off one return line to have the water flow go in two different directions. Late but not lease you can use the attachments to make great fountains and have different sounds effects as you adjust it in real time.