Evan and I are on the same page here.

The WalMart HTH 5-way kit is really very good, but with super-high chlorine levels you may have problems with pH.

I had forgotten to mention that pH must be at or below 7.2 for aeration to work.

I've been an advocate of the shot-glass method for years. You can even use 2 shots of distilled water to one of pool water to measure chlorine levels to 15ppm with the 5-way kit.

Unfortunately, if you don't have the chlorine neutralizer, it's tougher to get an accurate reading--unless you have the Taylor phenol red that has the neutralizer in it.