So yesterday I used the TF kit for the first time (also my first time testing CH) and I wanted to ask and see what kind of "blue" I should be looking for in the calcium hardness test. I think my CH was somewhere around 400, but it was a very gradual color change from red to purple to bluish purple to finally a pale blue with a hint of purple (added 2 - 3 more drops and the small hint of purple didn't change). Is this what I am supposed to be seeing?
TF-100 CH Test
- Thread starter BlueWave8
- Start date
The exact shade of blue varies from pool to pool. The fact that you are seeing purple at all is called a vanishing end point and can throw off the test results. Read through the extended test kit instructions for some suggestions on how to avoid a vanishing end point.
Tried 5 drops first last night, still had a fading endpoint. I'll have to try distilled water.
My guess is that there is lots of copper in the water from the copper/silver ion generator that appears to have been used throughout the pool's entire life. This is probably also the cause of the stains around the pool...
My guess is that there is lots of copper in the water from the copper/silver ion generator that appears to have been used throughout the pool's entire life. This is probably also the cause of the stains around the pool...
Will using a sequesterant change anything as far as the effects that the metals have on this test?
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