The calcium is not a problem UNLESS you have scaling. In California, you'd better test your fill water, before assuming that draining and refilling will fix things.

You *need* a K2006. But, stop-gap, check and see if you have a Walmart in your area that has this kit:
http://www.walmart.com/ip/HTH-6-Way-Test-Kit/17043668
This is a private label custom Taylor kit, that's compatible with the K2006 . . . and it will allow you to get a reasonable CYA level, now.

Meanwhile, keep the chlorine HIGH (OTO => orange!), and brush. Do NOT use any more stabilized chlorine. Get your FILL water tested (or, better, get the K2006 -- here's the info page: http://www.poolforum.com/pf2/showthread.php?14994) before you think about draining.)

Also, please post your pool info in your signature, here: http://www.poolforum.com/pf2/profile...=editsignature so we don't have to keep looking through the thread to see what sort of pool you have.

Do NOT drain, till you've tested your fill water. Do NOT drain, if you have an AG, vinyl or fiberglass pool. Doing so incorrectly can DESTROY those pools.