Struggling with accurate calcium hardness test fading endpoint (purple)

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Hkdman

Hkdman

Gold Supporter
Oct 31, 2021
51
Allen, TX
Pool Size
18000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair iChlor 30
Hello. I am experiencing the same issue . Taylor 2006c test kit. At about the 29ish mark, the color is decidedly purple. At around the 35-40 mark - then I notice it turns blue. Can I count the point where it turned blue as my CH hardness or is the fact that it is going from red to purple and then blue indicating that my results aren't accurate? Also - I saw you all mention the speedstir...do you use this only for CH or for all tests that you do? Thanks!
 
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mknauss said:
www.troublefreepool.com

Calcium Hardness

A drop-based test that measures the hardness in your water. Once measured, it is used … Read more…
www.troublefreepool.com www.troublefreepool.com

See the Notes section.
Click to expand...
Thanks. I had seen the interference video before and tried to follow directions but same thing. Purple until around 40ish. I'll try at 10mm as I had done this as wtmm. Maybe that will help.
 
Did the test at 10ml. Turned purple and then a few drops later turned to blue. Added the regent before hand per notes. Question though. If I count the pre drops and all of the drops until blue. Even though it turns purple.before blue is the ch still accurate or is it inaccurate since it turned purple.
 
Hmm. Had the water tested at Leslie's. Ch was at 189? Then again they also said ph was at an 8 but when I tested it was 7.6. Very frustrating.
 
Hkdman said:
If I count the pre drops and all of the drops until blue. Even though it turns purple.before blue is the ch still accurate or is it inaccurate since it turned purple.
Click to expand...
It is accurate. Count all drops of the R0012 for the final CH level.

Pool stores never test CH levels correctly. Quit going to pool stores.
 
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