Ahh-h, more details.

So, draining is NOT faster or easier. Scratch that.

Instead,

1. Start scooping and vacuuming the gunk.
2. Start adding plain 6% bleach, a gallon (10 ppm FC) at a time, every evening.
3. Get a K-2006 and report pH, TA, CH CYA values on the pool and pH, TA, CH values on the fill water.
4. Get a local OTO (see testkit page in my sig) and skip daily bleach dose when chlorine is dark yellow.
5. Post again after the pool is cleaned up, and you have K2006 readings -- or if you have an issue.
6. Meanwhile, keep pH between 7 - 8 and chlorine (OTO) between 5 (very yellow) and 10 (dark yellow)

PPM is must that: parts per million. For pool purposes, it's weight to weight, so a pound of cyanuric acid dissolved in a 120,000 gallon (1MM lb) pool will raise the CYA 1 ppm.