This is by far the best tap water conditioner I have ever used. I have a 5 gallon tank for my one male Betta fish and I use this API tap water conditioner every time. I use only 3 drops per gallon to detoxify chloramines and heavy metals, etc. It works immediately, and is still practically full after having it for 2 months. I recommend this product and love it completely! Do not listen to any negative responses. Very pleased with this product.

This water conditioner is at a reasonable price (well, to me it is). 1 bottle lasts a long time. I use this for my Betta, Bubbles. I also used it for Pirate and Anchor, my 2 Fantail Goldfish (R.I.P). This water conditioner hasn't harmed any of those 3 fish in any way. It doesn't smell, and it makes the water comfortable for my Betta. As it says on the bottle "Treats up to 2,360 U.S. gallons (8,934 L) of fresh or salt water". That's a lot for a 4 fluid ounce bottle of conditioner!! I recommend this product for all fish owners. (You can also reuse and recycle the bottle)