As far as I know, it's all the same stuff. I've bought CYA reagent at Leslie's that has worked just fine with both Ben's kit and with the Aquachem kit. Take a look at your instructions for the Aquachem kit--if there is an 800 number there, it would be worth calling it. Other members of the forum have posted that by calling the Aquachem number on the kit, they in the past have sent replacement reagents, sometimes free of charge.
Janet
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