Quote Originally Posted by FormerBromineUser View Post
My initial reason for starting this thread was to query the frequent recommendation of the HTH 6-way.
I think the main reason we suggest the HTH 6-Way drops kit is because it has a CYA test in it. Many people come on the forum and have algae and want help to get it fixed NOW. But, unless we know what their CYA reading is, we have no idea how high they are going to need to take their chlorine to be effective. Without that critical piece of information, we can't give good advice. We either tell them a shock level that is too low to do anything or tell them a shock level that is too high which puts their liner at danger of being bleached out.

So, though Carl is right that the kit also contains other useful tests, it is the fact that it can give us a CYA level to work with that is the main reason we ask people to buy it.