- Jul 12, 2008
- 664
- Pool Size
- 19000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
When I do the CYA test, back to the sun, sun over my shoulder, should the sun be shining through the side of the tube or should it be in the shade? I get 5-10 ppm lower if I hold it in the shade.