You are making the conversion harder than it needs to be. In a 15,000 gallon pool, each quart of 6% bleach will raise your cl by 1ppm. Test your pool as many times a day as is realistic (at least 3) and each time, add enough bleach to bring your cl level back up to 15. (Pour it slowly into the skimmer.) You want to try and maintain that reading, not let it bounce up and down. The more diligent you are in doing so, the quicker your conversion will be. Don't add anything else at this time except bleach.

You will need to buy a drops based test kit. Most of us use the one Ben sells at his www.poolsolutions.com website, but in the meantime, pick up the 5-way drops based kit at Walmart for about $15. It only tests chlorine levels to 5, but you can make it go higher by diluting your sample. Take one part pool water and mix it with two parts distilled water, test as usual and then multiply the results by 3. Be prepared for your pool to turn all kinds of nasty shades of green, but it will clear. Don't add any other stuff - no matter what your pool store insists that you need. No pucks, no bags of shock, yellow out, etc.

Run your pump/filter 24/7 and backwash any time the pressure rises by 8-10 psi.

It isn't that difficult and you'll be really glad you made the conversion. Keep us posted of how things are going. Also read some of the other posts people have made about their conversions. Some of them have pics so you can see what it's going to look like.

Hope this helps you get started!

By the way, do you know what your ph and cya readings are? If so, please post them.