This is the statement from the company:
AmQuel removes ammonia, chloramine, toxic pheromones, and chlorine. It is used for water changes, crowded aquaria, and control of toxic ammonia during the nitrogen cycle.
BUT there is a cavaet
Residual AmQuel and its reaction products are incompatible with the Nessler and Winkler-type test reagents, resulting in false, high ammonia and low oxygen concentration readings. All other types of test kits produce accurate test results, such as ammonia test kits using salicylate-type reagents. Kordon's AquaTru Test Kit #35970 for salt water and #35980 for fresh water are recommended for accurate test results. AmQuel will temporarily (for approximately 12 hours) lower redox
So make sure to use the correct ammonia test kits!!
Hope this helps!
Jenn