If your CYA is 0, then your shock level is 12-15 ppm. In your pool, each gallon of 6% bleach will raise your FC by about 4.6 ppm, so 2.6 gallons would get you from chlorine of zero to chlorine of 12 ppm. Until you order the Taylor kit, you can force your kit to read higher levels of chlorine by dilution, as described here http://www.poolforum.com/pf2/forumdi...ater-Chemistry. It's not as exact as the Taylor kit, by any means, but it's a decent ballpark.