Seachem Prime is a well-known and respected product in the aquarium industry. Until recently I had been using Aqua One Ammonia and Chlorine Neutraliser as a water conditioner. However, when I discovered ammonia in the tap water, I was forced to purchase a bottle of Seachem Prime because the Aqua One Ammonia and Chlorine Neutraliser does not neutralise ammonia (only reduces it). Seachem Prime allowed me to maintain my maintenance schedule, as even when conducting large, 60% plus, water changes with tap water containing ammonia the fish remained healthy and showed no signs of ammonia poisoning. Although this product is almost three times the price of competing products, it is definitely worth the extra money as the highly concentrated nature of Seachem Prime makes this product last a lot longer than competing products. Prime is by far the highest quality water conditioner on the market and I would not hesitate to recommend it to anyone.