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How long is Seachem Prime good for after opening?


number20121

This is just a theoretical question, after just posting in a D&D topic I tried to figure out how long a 8.5fl.oz / 250ml bottle of prime lasts if you have only a 20gallon tank with weekly 60% water changes.

That is 12 gallons changed, and you only need about 1/4 cap, as a full cap works for 50 gallons.

A full cap holds 5ml. So the 1/4 cap is 1.25ml. 250ml of the full bottle will last for 200 weekly water changes, that is roughly 4 years.

And that brought me to the initial question of the topic: how long is Prime usable after opening? Will it ever go bad? I tried googling but can't seem to find the answer, i also don't see an expiration date on my bottle.

Again, this is just a curiosity question. No way a bottle of prime would last 4 years in my house. With all the tanks I got and the frequent water changes, I need a new bottle about every 4 months :rofl

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I have never used Prime but Fumi does and he says it lasts for years and years. I think at least 2 and I seem to remember Daryl saying much longer than that.

It should say on their site somewhere .. :hummm Good to know for sure!! :)

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It is possible. You shouldn't dose more than 4x with fish in the tank. Without fish, it doesn't matter.

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I also want to know if its possible to overdose with prime.

I think the main issue with too much Prime is that it causes the water to be more resistant to dissolving oxygen...so you can potentially suffocate your fish if you used too much.

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I also want to know if its possible to overdose with prime.

I think the main issue with too much Prime is that it causes the water to be more resistant to dissolving oxygen...so you can potentially suffocate your fish if you used too much.

Which is the reason why the instruction on the bottle recommend that at temperatures above 86F to only use half the dose :)

Anyway, thanks for all the input! I tried the seachem site before posting here but didn't see anything. Maybe I missed it?

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I also want to know if its possible to overdose with prime.

It is entirely possible to overdose with Prime. The reason is that Prime, like other dechlorinators, is a reducing agent. As such, Prime works through a mechanism that depletes oxygen in the water. If you use too much Prime, you literally could suffocate your fish.

I talked to the Seachem people, and the max you should ever consider using is 5x recommended dosage. At least for ammonia, 1 dose of Prime neutralizes 1ppm ammonia. :)

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Thanks for this info,guys! I just started using it again and it's been sitting for a while,so this is very useful info!

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Hey Susan....here's a comment made by a Tech at the Seachem site. It never goes bad. Hope this helps. :thumb:

Prime is formulated to have a practical unlimited shelf life (i.e. practical within expected usage time frames, for example it's not likely someone would try to use a 20 year old bottle of Prime).

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Hey Susan....here's a comment made by a Tech at the Seachem site. It never goes bad. Hope this helps. :thumb:

Prime is formulated to have a practical unlimited shelf life (i.e. practical within expected usage time frames, for example it's not likely someone would try to use a 20 year old bottle of Prime).

That's great to know and very reassuring-thanks,Dennis! Gawd,can you imagine how BAD it would smell after 20 years! :yikes:no:

Edited by kukana

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