Keep adding bleach. Test as many times per day as you can and each time add enough bleach to get back to about 10 or so. I estimate your volume at about 7000 gallons. In your pool, each quart of 6% bleach will add about 2ppm of chlorine. Use that as a reference to know how much bleach to add each time you test. Run the pump 24/7.

Don't worry about the calcium hardness reading since you have a vinyl pool, but do keep an eye on your pH. If it drops any, you'll need to add some Borax to raise it up. You want it between 7.2-7.8. (Don't test pH when the chlorine is high or you'll get a false reading.)

Do us a favor, please. To make it easier for us to help, if people will create a signature line with their pool specs, it keeps us from having to reread through posts to find out basic information. You can create a signature by clicking on 'settings' in the upper right-hand corner of the homepage. In your sig, please put type of pool, volume, type of filter, size of pump, whether or not you have a SWCG or any water features and the fact that you do or do not have a K-2006. Thanks!

BTW -- I deleted your other post since it was pretty much duplicate information.