Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Look at the dilution, the dose. Not just the bottle size.
Seachem Prime and Clear Pond Chloramine Buster are dosed at such tiny amounts I use an eye dropper, and I have over 1000 gallons of tanks.
I have bought Seachem Safe, but am waiting until I run out of Prime and Chloramine Buster.
Several years ago I compared the price of various dechlorinators.
Prime and Chloramine Buster came out to about 2 cents per 10 gallons of treated water.
The others were at least 10 cents, because of the dosing- the others were dosed at much higher rates. (meaning they had less active ingredient in the bottle).
The smaller the bottle the worse the pricing. Up to $1.50 per 10 gallons of treated water.
Chloramine Buster, 16 ounce treats 8,000 gallons.
Amquel, 16 ounce treats 960 gallons.
This makes the Chloramine Buster 8.3 times as concentrated. But it is not 8 times the price. More like about double the price per bottle. So it ends up 1/4 of the price when you compare how many gallons it treats for that price.
Pond products are often available in larger bottles, but don't go by the size of the bottle- a 16 ounce of Prime ought to be just fine for a single 55 gallon tank.