You need a good test kit. We recommend the Taylor K-2006. This place seems to have a good price for it. http://www.amatoind.com/taylor-k2006-test-p-555.html

But, in the meantime, while you are at Walmart, see if they have a 5 or 6-way kit for about $15? Test and post.

By the way, cya of 100 is really high and is going to cause you to have to run higher than normal cl levels. The only way to lower it is to do a partial drain. If you drain half, that would put it at about 55 which would be much more manageable.