1. Stop using trichlor - that's why your CYA is so high.
2. Add 7 gallons of 6% PLAIN household bleach should get you to 25ppm FC (OTO orange).
3. See if you can get the HTH 6-way kit at your Walmart (check availability)
4. If not, get a cheap OTO/phenol red testkit.
5. Add enough PLAIN 6% household bleach each EVENING to bring your OTO to orange. Filter / pump on 24/7
6. Brush the pool completely at least every other day.

Let us know when you can test CYA for yourself.