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How much Safe = Prime
I want to know how much Seachem Safe it takes to make the equivalent of 500 ml. of Seachem Prime?
I'm confused about some math.
A bottle of Seachem Safe states that 1.25 grams treats 1,250 liters.
A bottle of Seachem Prime states that 500 ml. treats 20,000 liters.
So 20,000 liters divided by 1,250 liters = 16
16 x 1.25 grams = 20 grams
So 20 grams of Seachem Safe would = 500 ml. of Prime.

Here's where I get really confused:
To regenerate Purigen, Seachem's web site states to use 4 tablespoons of Prime or 16 grams of Safe (per cup of water).
According to my formula above it only takes 20 grams to make 500 ml. of Prime so 16 grams would equal 4/5 of the entire 500 ml. bottle not just 4 tablespoons.
Did I make a mistake calculating my formula or is this a question I should be asking Seachem?
Thanks in Advance,
Ed
I'm confused about some math.
A bottle of Seachem Safe states that 1.25 grams treats 1,250 liters.
A bottle of Seachem Prime states that 500 ml. treats 20,000 liters.
So 20,000 liters divided by 1,250 liters = 16
16 x 1.25 grams = 20 grams
So 20 grams of Seachem Safe would = 500 ml. of Prime.

Here's where I get really confused:
To regenerate Purigen, Seachem's web site states to use 4 tablespoons of Prime or 16 grams of Safe (per cup of water).
According to my formula above it only takes 20 grams to make 500 ml. of Prime so 16 grams would equal 4/5 of the entire 500 ml. bottle not just 4 tablespoons.
Did I make a mistake calculating my formula or is this a question I should be asking Seachem?
Thanks in Advance,
Ed
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Planted Tank Guru
Didn't bother looking at the math, but why not just regenerate with bleach? Would work even better in my opinion. Seachem has also mentioned it's a great means of regenerating Purigen. One tip also, I have hear some mention that once purigen is used, it is best to keep it wet/submerged all the time, even if storing not in use. Not sure how necessary that is, but thought I'd pass that bit of info your way.
You have to use prime after bleach regeneration. Prime alone won't do anything?
To much math for me lol
Sent from my SMG386T using Tapatalk
To much math for me lol
Sent from my SMG386T using Tapatalk


Planted Member
You calculated wrong.
Safe concentration is different from Prime.
Use 1 gram of safe per cup of water.
Use 100 mg Safe (scoop) per each 100 L (25 gallons) as needed to reduce chlorine and chloramine or per 25 L (6 gallons) for ammonia.
Safe concentration is different from Prime.
Use 1 gram of safe per cup of water.
Use 100 mg Safe (scoop) per each 100 L (25 gallons) as needed to reduce chlorine and chloramine or per 25 L (6 gallons) for ammonia.
Planted Tank Guru
Doh! Completely slipped my mind.
Planted Tank Guru
I worked through your question, doing the math a different way, and also came out scratching my head.
Perhaps Seachem did the experiment and simply found that the dosing they state is what works, but works differently for each project, so labeled it that way?
Side note:
If you buy Prime and Safe from Big Als (simply chosen because they carry both products) it will cost about half as much to regenerate Purigen using Safe as Prime.
Not including shipping, it would cost about $1.50 per cup of soak water to use Prime, or $.65 per cup of soak water to use Safe.
Mango, here is a copypaste from Seachem web site on their Purigen page, about regenerating it.
"Regeneration: Soak in... bleach... Rinse well, then soak for 8 hours with a solution containing 4 tablespoons of PrimeŽ or 16 grams of SafeŽ per cup of water"
When you work through the math to see how much Safe = how much Prime it comes out differently if you start with the aquarium dosing compared to if you start with the Purigen regeneration dosing.
Perhaps Seachem did the experiment and simply found that the dosing they state is what works, but works differently for each project, so labeled it that way?
Side note:
If you buy Prime and Safe from Big Als (simply chosen because they carry both products) it will cost about half as much to regenerate Purigen using Safe as Prime.
Not including shipping, it would cost about $1.50 per cup of soak water to use Prime, or $.65 per cup of soak water to use Safe.
Mango, here is a copypaste from Seachem web site on their Purigen page, about regenerating it.
"Regeneration: Soak in... bleach... Rinse well, then soak for 8 hours with a solution containing 4 tablespoons of PrimeŽ or 16 grams of SafeŽ per cup of water"
When you work through the math to see how much Safe = how much Prime it comes out differently if you start with the aquarium dosing compared to if you start with the Purigen regeneration dosing.
Planted Member
I've been told to use 1 gram of Safe per cup water by Seachem long ago.
Been using that and no problems at all.
16 grams of safe per cup of water??? I honestly think they are just trying to make you use up the product faster so you can buy more.
If 1 gram per cup of water worked for me, there's no way 16x is right.
Given the instructions from Seachem, 4 tablespoon prime is about 60mL of prime.
Safe to Prime is 200mg to 5mL
So 60/5 = 12
12*200mg = 2400mg or 2.4g
And again, how seachem got 16G just makes no sense.
Been using that and no problems at all.
16 grams of safe per cup of water??? I honestly think they are just trying to make you use up the product faster so you can buy more.
If 1 gram per cup of water worked for me, there's no way 16x is right.
Given the instructions from Seachem, 4 tablespoon prime is about 60mL of prime.
Safe to Prime is 200mg to 5mL
So 60/5 = 12
12*200mg = 2400mg or 2.4g
And again, how seachem got 16G just makes no sense.
Algae Grower
Quote:
Originally Posted by Seachem
Seachem Prime:
Use 1 capful (5 mL) for each 200 L (50 gallons*) of new water.
Use 1 capful (5 mL) for each 200 L (50 gallons*) of new water.
Quote:
Originally Posted by Seachem
Seachem Safe:
Safe™ is the dry version of PrimeŽ and shares all of it’s advantages; however, Safe™ is even more concentrated than PrimeŽ.
Use 100 mg Safe (scoop) per each 100 L (25 gallons)
Safe™ is the dry version of PrimeŽ and shares all of it’s advantages; however, Safe™ is even more concentrated than PrimeŽ.
Use 100 mg Safe (scoop) per each 100 L (25 gallons)
Quote:
Originally Posted by trapperwolves
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So 20 grams of Seachem Safe would = 500 ml. of Prime.
500mL Prime = 20,000mg Safe = 20grams Safe
You got it right. I'd ignore everything else for removing chlorine/chloramine from new water.
Planted Tank Guru
I would think this is a case of two different uses for the two products.
Using Prime to remove chlorine from water is working with a tiny amount of chlorine in the water. When using Safe to remove chlorine after a bleach water soak, it is assumed there is much higher chlorine levels so much higher prime is used.
If we were speaking of using both Prime and Safe for simple dechlor of drinking water, the amount might be totally different.
In either case, it is just an estimate at best since the amount of chlorine in each case will vary. Leave the Purigen set out for a while and the chlorine may gas off by itself but then it would not be prudent for the instructions to hope for you to wait the correct amount of time. They give the best guess estimate for safe use and if it costs you a bit more, that is a whole different question.
Using Prime to remove chlorine from water is working with a tiny amount of chlorine in the water. When using Safe to remove chlorine after a bleach water soak, it is assumed there is much higher chlorine levels so much higher prime is used.
If we were speaking of using both Prime and Safe for simple dechlor of drinking water, the amount might be totally different.
In either case, it is just an estimate at best since the amount of chlorine in each case will vary. Leave the Purigen set out for a while and the chlorine may gas off by itself but then it would not be prudent for the instructions to hope for you to wait the correct amount of time. They give the best guess estimate for safe use and if it costs you a bit more, that is a whole different question.
Planted Tank Enthusiast
Thanks for all the replies and MERRY CHRISTMAS everyone.
Here is the response I received directly from Seachem.
Seachem Support 100215 (Seachem Laboratories)
Dec 23, 15:53
Hi Ed,
According to our chemist, the numbers are based on actual dechlorinator concentrations in each product, which are different. Furthermore, Safe does not contain stabilizers like Prime, therefore, cannot be mixed with water for dosing as a liquid long term. Safe needs to be dosed as a powder and Prime is the liquid version.
Does this answer your questions? If not, please let us know how we can be of further assistance. Have a great day!
Seachem Support 100215
Here is the response I received directly from Seachem.
Seachem Support 100215 (Seachem Laboratories)
Dec 23, 15:53
Hi Ed,
According to our chemist, the numbers are based on actual dechlorinator concentrations in each product, which are different. Furthermore, Safe does not contain stabilizers like Prime, therefore, cannot be mixed with water for dosing as a liquid long term. Safe needs to be dosed as a powder and Prime is the liquid version.
Does this answer your questions? If not, please let us know how we can be of further assistance. Have a great day!
Seachem Support 100215
Trapperwolves
75 GallonRainbow Fish Tank/Amano Shrimp
29 GallonCelestial Pearl Danios/Yellow Shrimp
20 GallonEmber Tetras/Orange Shrimp
10 GallonChili Rasboras/Cherry Red Shrimp
75 GallonRainbow Fish Tank/Amano Shrimp
29 GallonCelestial Pearl Danios/Yellow Shrimp
20 GallonEmber Tetras/Orange Shrimp
10 GallonChili Rasboras/Cherry Red Shrimp
Last edited by Darkblade48; 12272015 at 07:04 AM. Reason: Please use the edit function for back to back posts
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