I'm confused

[topless]

I'm finally making some progress with my pool. I can see the bottom in the 4' section and as of this morning my tests showed
temp-77
FC-6.5
CC-1.5
ph-7.5-6
cya -50
TA-300

The TA is my next area I'm going to work on. I will start adding the acid and aerating the pool. I found an interesting setup in my inherited box of pool stuff. It has a fitting that plugs into the Polaris jet and turns 90 degrees and is adjustable height before another 90 and ends with a parallel sprayer head. I checked it, and it is perfect for spraying 20 streams of water into the surface of the pool. I can aim the spray 360 degrees so I can have a fountain or straight into the water with maximum force. I remembered seeing it, but had know idea what to use it for until I saw the pictures in the other thread.