I'm new here and I must say that this site if fantastic! I've already ditched the granule shock in favor of the liquid bleach! My question is now about the positioning of the valve as shown in the pic below. The left is the feed from the bottom of pool and the right is from the skimmer. I do not understand where the handle needs to be placed to a) 50/50 split from both b) just "drain" c)just skimmer. Is there any reason to change these around? I'm assuming it should be all skimmer when vacuuming. The writing on the valve itself is not legible so any advice you can give would be wonderful.