Now that I have a pretty good handle on my water chemistry (that's to this site and the TF-100), I turn my attention to try and better understand my plumbing. My skimmer and drain piping is shown below:
If I understand correctly, pipes 1 and 2 are my pool skimmer and drains and pipe 3 is my spa drains. Any way to tell which valve is which? Or do I just have to turn them and see if my skimmer is working? I assume I should turn the pump off prior to turning valves? Also, this is kind of embarrassing, which way should I turn the handle? Handle pointing up or handle pointing down to close the valve? Thanks in advance for your help.