- May 3, 2014
- 62,758
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
With the test kit shown, any TC above 3 will skew the pH results.
Brownish water
- Thread starter consigliere08
- Start date
Oh, that explains a lot. I'll definitely order these from Amazon. In the meantime, can i use DPD tests for FC? Or should i just wait for TC to drop below 3 and then test pH and adjust if necessary?
- May 3, 2014
- 62,758
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
You can use the DPD test for FC.
You can try diluting the sample with distilled water to read the pH.
You can try diluting the sample with distilled water to read the pH.
I'll give it a try. Should i dilute the sample with a few drops of distilled water or in a larger ratio?
- May 3, 2014
- 62,758
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
From PH - Further Reading
A better way to test pH in high FC water (below 20ppm) is to mix a 1:1 solution of pool water with DISTILLED water. Then test pH. Doing that will cut the FC down by half but have almost no effect on pH (due to the much higher alkalinity of pool water compared to distilled water).[4]
Distilled water is typically at a pH of 6.9-7.0. It has zero carbonate alkalinity and no mineral hardness. Diluting a pool water sample with it doesn’t change anything since the alkalinity of the pool water will resist any changes to pH introduced by the distilled water. That’s why it works better than adding R-0007 because the thiosulfate in R-0007 chemically reduces the chlorine but that reaction causes a shift in pH.[5]