Bleach problems? confused

[hulla]

You have too much stabilizer in the pool which is limiting the effectiveness of the chlorine. You test the level at 150 but it may be even higher.

Bring the stabilizer (CYA) level down by partially draining then refilling. This will also at least partially correct your alkalinity.

Search for Bens Best Guess Table for info on chlorine/stabilizer levels. It's a sticky.

[waterbear]

Here is link to the best guess table
http://www.poolforum.com/pf2/showthread.php?t=365
With a CYA of 150 ppm (and it might even be higher since CYA cannot be accurately tested above 100 ppm without dilution of the sample)
you need to be running your FC at at least 8 ppm up to 15 ppm (I would go with at least 10 ppm) for NORMAL CHLORINATION and shocking to a MINIMUM of 25 ppm to achieve proper sanitation and to actually reach shock levels!

IMHO, the best thing to do would be drain and refill to get the CYA down to a range of 30-50 ppm! At this point I would strongly suggest switching over to bleach and not using the trichlor. Trichlor is about 50% CYA and with every tab that you use you are raising the CYA in your pool!