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Stratt14goldies

How do you guys measure prime?

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Apologies if this is the wrong forum.

I was wondering how you guys measure Prime. Do you use a syringe with ml's or something else?

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The instructions on the bottle tells you that under normal circumstances, you should use 1 ml for every ten gallons. There are threads in the cap to mark each ml. Of course, using a syringe is the most accurate way, and this is what I do. :)

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My tank holds about 85 gallons, and 1 capful of Prime treats 50 gallons. So I usually add about 2 capfuls of Prime and call it good. I know that's a little more than necessary, but I would rather add too much than too little, especially now that I have trace ammonia in my tap water.

No fancy measuring tactics here, lol.

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I use the cap as well. Mine is a large bottle so one cap treats 100 gallons. So I just add in 2 caps.

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I use the cap as well. Mine is a large bottle so one cap treats 100 gallons. So I just add in 2 caps.

Do you use 2 caps for one water change?

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If you have very small quantities of prime to measure, you can buy the smallest bottle of prime (I think it's 50 ml?) and it comes with a dropper cap. Then you can dose 2 drops per gallon. I do this, and then refill the small bottle from the larger ones for economy. Comes in handy if I need to dose a bucket or a small tank.

Edited by Courtney

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I usually do about a capful... I have a 40 gallon, the cap treats 50 and like Sakura I'd rather be a little over than under ;)

Sent from my iPhone using Tapatalk

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If you have very small quantities of prime to measure, you can buy the smallest bottle of prime (I think it's 50 ml?) and it comes with a dropper cap. Then you can dose 2 drops per gallon. I do this, and then refill the small bottle from the larger ones for economy. Comes in handy if I need to dose a bucket or a small tank.

That is an awesome tip, thank you! :D

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Maybe that was you Courtney that told me the same thing as you told telesc. I use 1 capful for my 55 gal. and when I do about a 60% weekly water change I'll just add in 1 capful. Better having a little extra than not enough. I keep a gallon jug filled w/water to tap off tank if needed days later and I put in a few drops. (heard it from you courtney...I guess. thanks)

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I use 1 capful for my 40 gallon as well, as I have the 1cap=50gal-sized bottle. It's better to be safe and overdose Prime by a little bit than sorry you didn't, I assure you.

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No fancy measuring tactics here, lol.

Same here, I have a 55 gallon so I usually just slop in a capfull 'plus some' :rofl

For my smaller tanks I guestimate, I just figure better too much than too little and go with that.

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5ml treats 50gallons, 5ml is also give or take one teaspoon. The dripper top from the small bottle fits on the big bottle.

I have a 40 breeder (close to 45 gallons)I have the dripper top from the small bottle on my larger bottle and I use a teaspoon at every water change.

sent from the bathroom using Tapatalk 2

Edited by Ridewithme38

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I use a syringe, but now am interested in this dropper capp--I did not know about that!

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I think I'm the only one around here who trots out the small prime bottle advice like a broken record, so if you heard it here, that was probably my fault. :)

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5ml treats 50gallons, 5ml is also give or take one teaspoon. The dripper top from the small bottle fits on the big bottle.

I have a 40 breeder (close to 45 gallons)I have the dripper top from the small bottle on my larger bottle and I use a teaspoon at every water change.

sent from the bathroom using Tapatalk 2

Yes, same with me. 5ml = 1.01tsp so I put in a tsp with each water change on my 40g.

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If you need a syringe, just stop by the pharmacy and pick one up. They will usually give a 1ml oral syringe or insulin syringe (with the needle removed) for free. My dog takes oral meds twice a day so I buy them by the 100's.

These will allow you to measure down to 0.1ml for treating 1 gallon.

Edited by Philcav7

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Philcav7, Thanks for the great tip. I think I have a pharmacy med. syringe laying around in my kitchen from when my daughter was real young. I'm going to do it this way now for my gallon jug.

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I usually use the cap ,two cap fulls for the 55, and one for the 29 high, I also have the dropper bottle and use this for the smaller Betta tank ;)

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Since you can use up to 4x the dose of Prime, I usually just go by "that looks good" - which is about half a cap for 20 gallons, a full cap for 50 gallons, a quarter cap for 10 gallons etc etc.

I try to rather use a tiny bit more than not enough, but even with that a big bottle lasts me for many months.

Has worked for me and my fish for the past four years.

Edited by Oerba Yun Fang

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I find it easiet to dilute the prime. I put 100 ml of Prime into an empty 500 ml Prime bottle (labeled "diluted 1:5") and fill it with water. With the diluted stuff, I need 1 teaspoon for 10 gallons. That kind of measurement is easy and accurate.

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Since you can use up to 4x the dose of Prime, I usually just go by "that looks good" - which is about half a cap for 20 gallons, a full cap for 50 gallons, a quarter cap for 10 gallons etc etc.

I try to rather use a tiny bit more than not enough, but even with that a big bottle lasts me for many months.

Has worked for me and my fish for the past four years.

I just started using prime the past few weeks/several weeks and I too go by,"that looks good" ha ha

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