I am opening my pool and it is very green with lots of algae and I think even back swimmers and/or water boatman. The CYA is testing at zero. I also tested the pH, which is off the charts like. Bright red/purple color. Should I just start slamming with chlorine instead of adjusting the CYA and pH? Also I have a robot vacuum but should I be using a better vacuum to start with all this? Please HELP!!! And thank you!!!!