I have tried everything in the market for ammonia spikes when I have trouble in my 55 gal tank. Now don't get me wrong I like Seachem products but I bought purgeen 2 of them to be precise. Now one should have more than took care of the spike due to a fish that passed an I failed to find right away. So I used both an done a quarter water change. After a few days my level were still high. SO I tried ammo chips. Over night my levels went to 0. Now I know what some of you going say but I checked the puregeen it did change color but not to the point that it need recharge. I guess my point is for a emergency ammo chips works better in the short term. The only draw back is you need to wash it really good before you put it in. If not you will get a cloudy tank an even with washing it still clouded a little bit nothing a filter won't handle an the important thing is the ammonia is taken care of an you can recharge it with 5 percent salt solution. Thanks for listening hope this helps beginners out there