TF-100 Questions

[BillB]

My TF-100 measured my CH AT 1,100.
I've tested it three times with the same results.
I have had my water tested at 2 pool stores and the CH measured 450 and 550.
I'm starting to wonder which is correct.

FC
Last night I did 3 FC tests within about 15 minutes to see how consistent they were.
The samples came from exactly the same place in the pool.
They measured 3.5...2.0...3.0
The only variable I can think of was the amount of powder added.
The powder I received is full of little white boulders that makes it very difficult to get exactly the same amount each time.
Any pointers?

 

[jblizzle]

The amount of powder does not matter too much ... as long as you have enough. Too little can result in problems. Just be sure you add the drops with the bottle vertical about 1 drop a second.

Have you reviewed this: extended-test-kit-directions-t25081.html#p206396
The CH can be a little tricky, especially without the use of the SpeedStir.