Help me with my math, please.

[azbigjohn]

I'm usually not mathematically challenged, but this one seems to be driving me nuts. I can't seem to set it up right.

Somehow, I managed to run my specific gravity up to 1.029. I want to bring it back to 1.026. With a total water volume of 200 gallons, roughly how much water do I need to remove and replace with RODI water to get there.

If you can show me the setup, that would help, too... then I need to go do a math class and knock the rust off.[emoji4]

 

[JimWelsh]

You need to remove enough water to leave 26/29 of the total volume. 26/29 = 89.7%, so you need to remove 100 - 89.7 = 10.3% of the total volume. For 200 gallons, that would be 20.6 gallons. After removing 20.6 gallons, then replace that with 20.6 gallons of RO/DI.

 

[beaslbob]

depends

 

[beaslbob]

on the specific gravity of the replacement water.

I presume with sg of 1 the previous post was probably correct.

 

[JimWelsh]

on the specific gravity of the replacement water.

I presume with sg of 1 the previous post was probably correct.

Hmmmm... Let's see.... I wonder what the density of pure water divided by the density of pure water is....... It just might be close to 1. Probably a safe presumption, there @beaslbob .

 

[azbigjohn]

Thanks everyone... my brain just wouldn't go there...

 

[beaslbob]

Hmmmm... Let's see.... I wonder what the density of pure water divided by the density of pure water is....... It just might be close to 1. Probably a safe presumption, there @beaslbob .

gee

do you mean specific gravity?