Yet pool has never been tested at a level of higher than .1 ppm of iron. Where does it go?
Source water has .1 - .6 ppm iron (well)
- Thread starter Mattou01
- Start date
- May 23, 2015
- 25,792
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
0.1ppm is well below the limit of most test kits and levels that low are really only detectable by water testing laboratories. Please explain where you are getting your numbers from ?
a combination of computers at pool stores, and my test kits. Maybe I just answered my own question 
The pool stores variance for metals (per them) is +/- 0.3 at 0.3, with 0.3 being the commonly accepted threshold for staining. Basically 0 to 0.6 is suspect. If they say it's 0.6+, you likely already have irrefutable proof the levels are high.
- May 23, 2015
- 25,792
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Most iron tests that are reagent based are not really designed to detect low levels. The chemistry just doesn’t work well. If someone had to know what the iron levels are at sub-ppm levels, advanced laboratory techniques would be used involving high performance liquid chromatography or inductively couple plasma mass spectrometers. These are techniques that are only suitable in a research lab.
Liquid reagent testing works for municipal water suppliers and steam boiler/cooling tower water because you can have levels well above 3ppm as allowable limits. So the colorimetric testing works ok for that. Iron is not a water contaminant by definition and so knowing ultra low levels is almost never necessary. It’s only pools that are affected by iron in that zone of concentration.
Your levels are zero for all intents and purposes and the fact that you get little to no staining is simply confirmation that iron is not an issue for you.
Liquid reagent testing works for municipal water suppliers and steam boiler/cooling tower water because you can have levels well above 3ppm as allowable limits. So the colorimetric testing works ok for that. Iron is not a water contaminant by definition and so knowing ultra low levels is almost never necessary. It’s only pools that are affected by iron in that zone of concentration.
Your levels are zero for all intents and purposes and the fact that you get little to no staining is simply confirmation that iron is not an issue for you.
U guys are the best! I’m not gonna worry about it at this time! I’ll figure out another reason to worry
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