For reference, in your pool, each quart of 6% bleach will add about 2ppm of chlorine. Use that to help you figure out doses to add. With a CYA level of 30-35, you want to try and keep the chlorine around 15ppm while you are working to clear this up. You can continue to use the trichlor tabs for awhile longer but you're still going to need to use bleach as well. When your CYA reaches around 50, you'll want to stop using the tabs and just use bleach.