Alkalinity question

[H823Putt]

   What is the difference between Total Alkalinity and Adjusted Total Alkalinity?  I needed some supplies yesterday but my regular dealer is not open on Sundays so I went somewhere else. I brought a sample of water to be tested and was told everything was fine but my alkalinity is low at 55. I said ok, went home and when I looked at the test sheet, it had

Tot. Alkalinity  -  100
Adjusted TA    -   55

I proceeded to test my water with the test strips that I just bought and alkalinity was around 100.

How do you get adjusted TA?
Should I raise it from 55(on low side) or leave it(100 ok)

[In Canada eh]

3putt,

  Your question got me thinking that I had saw the term adjusted alkalinity before.  So I dug through a couple of books at work on disinfection/pH/Alk.

  The only reference I could find was pretty long winded but it implied that a Alk measurement was taken twice, once from a representative sample (your water sample) .  Then again after the pH had been adjusted to a known value in the test used it was pH 7, the alkalinity was then called "adjusted".  

  Sound like a load of POOP to me from a old book on water treatment, probably written by an engineer

I would just continue to do what you have been

[Vinny]

It's on the last page of the Taylor book - Table K (at least I think thats it)!

It has to do with the PH and CYA in a body of water.

[In Canada eh]

Vinny,

   Your right, its the very last page of the Taylor book and it makes a lot more sense then the explanation I was trying to figure out.

[Vinny]

I'm really starting to think how I really need a life!