Boric Acid - Just need someone to check my math?

[Clueless]

I'm flirting with the idea of doing the boric acid thing instead of the Mule Team route as muriatic acid scares the bejeezus out of me... I simply do not care about the additional cost (if any).

That having been said, I assume my 17.5K vinyl lined in ground is currently sitting a big fat 0 borates. I entered 50 into the pool calculator and I'm told I need 668 oz by WEIGHT of boric acid. Divide that number by 16oz and it appears I need about 42 pounds of boric acid.

Duda Deisel has a 55lb bucket for $75 so if I'm right, that means I'll have some leftover for next year.

So....

1. Does my math add up?
2. Am I missing anything?
3. Do you just dump 42 pounds into the pool all at once?
4. How long do you stay out of the pool? That's a lot of chemical!
5. No other chemicals needed right?

Thanks and thanks so much for all the help. This is my first year with a pool and it's been a piece of a cake thanks to the help here (especially Jason!)

 

[JasonLion]

Yep, 42 lbs. It looks like you have everything right. I would pre-dissolve the boric acid in batches and pour slowly in front of a return with the pump running. Let the pump run for an hour, or more, test and adjust the PH if needed. You might need a small PH increase, you might not. Thats all.