I am new at this stuff so please bare with me. I bought a HTH 5 test kit the other day. This is my reults.

CL=>5ppm
ph=7.5 to 7.8
TA=100ppm
Total hardness=0 I believe. When 5 drops were added solution did not change color, suppose to be red to indicate hardness.
CYA=>100ppm liquid was little below the 100 mark on the tube.

Vinyl pool 16X32 IG. Hardness range should be from 200-800pmn and CYA should be 30-50ppm. My chlorine is always high deep yellow color. I shocked pool 1 week prior to memorial day weekend and have been using an automated hayward chlorinator and trichloro 3" pucks set at between 0 and 1. My chlorine does not seem to drop off even though I have the Chlorinator set very low. Where is my problem, or Do I have a problem? Water is brilliantly clear. Any comments/suggestions would be grealy appreciated.