Agree I have used prime for 15 years but I have tested it again & again on ammonia spikes & it does not do anything, on small amonia bumps it has helped. Sorry I was in a rush when I posted, I did not mean to be rude. I have had others test several times we have found that it will not help n a large spike, only bumps. A freind of mine was a seachem rep for a while & he explained how it can work, but I have not seen it. I still think Prime is the best de-chlorinator.
In the past large spikes were always fixed by several water changes & keeping an eye on the tank.
In the past large spikes were always fixed by several water changes & keeping an eye on the tank.