GoldLenny
Senior Member? Do I get a 5% disc.?
EDTA (Ethylenediaminetetraacetic acid) is the part of most dechlor products that treats heavy metals in tap water and most other water sources... even natural well or spring water can have heavy metals in it. Untreated heavy metals accumulate inside of fish organs (kidneys, liver, etc.) and cause all kinds of health problems over time. EVen things like copper, zinc, lead etc. from home plumbing... and all the other heavy metals that leach into our water supplies from factories, shipping and good old Mother Nature when water drips down through layers of earth to get back to an underground aquifer or reservoir water that is in contact with the earth. http://en.wikipedia.org/wiki/Ethylenediaminetetraacetic_acid (also read the Chelating Agent link in the first paragraph)
The sodium thiosulfate ONLY treats chlorine/chloramine, not heavy metals.
As far as *why* Prime costs more... as previously mentioned, API's Tap Water Conditioner costs around $5-$6 for a 16 oz. bottle which treats up to 9,400 gallons. Prime costs $10-$12 for a 16 oz. (500ml) bottle and only treats 5,000 gallons so it would take almost two bottles of Prime to treat what one bottle of API treats... so technically it could be as much as 4-5X's more costly depending on the prices paid for each product. They are both good products... just Prime isn't needed for most experienced hobbyists with mature and fully cycled tanks or those who are not stuck with cycling with fish.
Were you using the Top Fin Tap Water Dechlorinator or the Top Fin Tap Water Conditioner? They are separate products and the Top Fin Tap Water Conditioner adds a lot of other unnecessary crap like slime-this/stress-that type products. I NEVER recommend those types of products unless there is full disclosure as to what is in it and then the informed hobbyist can decide whether then need aloe in their water or some other completely unnatural and unnecessary chemicals in their tanks. Lots of people accidentally buy the wrong product since they are so similarly named... now for that, you could say Top Fin sucks in general but the Top Fin Tap Water Dechlorinator is simply Sodium Thiosulfate and EDTA in a water solution... just not as concentrated as API's Tap Water Conditioner (I wish they'd change it to Dechlorinator.... since Conditioner's from other companies adds other crap)
The sodium thiosulfate ONLY treats chlorine/chloramine, not heavy metals.
As far as *why* Prime costs more... as previously mentioned, API's Tap Water Conditioner costs around $5-$6 for a 16 oz. bottle which treats up to 9,400 gallons. Prime costs $10-$12 for a 16 oz. (500ml) bottle and only treats 5,000 gallons so it would take almost two bottles of Prime to treat what one bottle of API treats... so technically it could be as much as 4-5X's more costly depending on the prices paid for each product. They are both good products... just Prime isn't needed for most experienced hobbyists with mature and fully cycled tanks or those who are not stuck with cycling with fish.
Were you using the Top Fin Tap Water Dechlorinator or the Top Fin Tap Water Conditioner? They are separate products and the Top Fin Tap Water Conditioner adds a lot of other unnecessary crap like slime-this/stress-that type products. I NEVER recommend those types of products unless there is full disclosure as to what is in it and then the informed hobbyist can decide whether then need aloe in their water or some other completely unnatural and unnecessary chemicals in their tanks. Lots of people accidentally buy the wrong product since they are so similarly named... now for that, you could say Top Fin sucks in general but the Top Fin Tap Water Dechlorinator is simply Sodium Thiosulfate and EDTA in a water solution... just not as concentrated as API's Tap Water Conditioner (I wish they'd change it to Dechlorinator.... since Conditioner's from other companies adds other crap)