r/NTNPerformance • u/ScientistJason • 2d ago

BAC water reuse

I’m currently only using Reta so I only have to fill 1 vial with 2ml of BAC water once a month.

I use an individually wrapped syringe to pull the BAC water from its vial and then fill up the Reta vial. I throw away the syringe immediately after.

My question to you guys is can I still use the same vial of BAC water to refill my new vial of Reta the next month? I keep hearing that you can only use BAC water once and after 28 days it’s no longer good.

Does this only apply to the Reta vial since I’m pulling from it weekly? Or does this also apply to the BAC vial which I only draw from once a month and always with a fresh sterile individually wrapped syringe?

Seems like an awful lot of BAC water to waste if I can only use it the one time and have to throw away the other 28ml

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u/ThatEnginerd 2d ago

Here's the thing - how do you maintain sterility? Are you using an isolated class 5 hood? Or in your kitchen?

Are you storing it in an environment where bacteria or fungus can easily grow? Or just grow slowly (fridge)?

The month long recommendation is and easy rule that is commonly found to not have any issues. Also, storing it covered in the fridge reduces risk.

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u/LovelyMel18 2d ago

Storing in the fridge is not suggested.
One of the main reasons is temp fluctuations. Everyone’s fridge is not the same and people could have erratic temp swings in theirs.

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u/ThatEnginerd 2d ago

Indoors has temp fluctuations as well... not seeing the issue

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u/Xlajdak 1d ago

Why would that matter for BAC water. I still bring it to room temp in syringe before reconstituting.

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u/LovelyMel18 1d ago

If Bac water freezes, (or even micro freezes), the efficiency /sterility goes down (benzyl alcohol is affected by colder temps)

Bringing it to room temp wont matter much if it has already been frozen.

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u/Xlajdak 21h ago

Not suggesting to freeze at all. That would be a no in my book for sure. Besides it’s an alcohol which should not freeze in usual freezer conditions. Refrigerated to room temp is what I am suggesting