Couldn't get to the pool store that does water testing. I bought a Basic 5 Test Kit. The 1st Chlorine reading at 2-3 seconds was a 5.0. After 2 minutes, it was > 5.0 (it looked a bit darker (more orange) than the sample guide color.) The pH was 7.6. It said to add an extra drop of #4 when doing the pH and Alk tests, so I did. The Alk took 17-18 drops to turn clear/light yellow (so it's 170-180 when it should be 120-150). So while my pH is good, my Alk is too high and my Chlorine levels are still out the roof. My pool is 9 years old, 18x36 Grecian shape with a swim out and built in covered steps. It gets at least 8 hours of full sun. All of the equipment is Haywood and it's a sand filter. I also have a pre-plumbed Polaris 360 and pump.
What should I do next? Drain more water out and add fresh?