Quote Originally Posted by SoCalBoo
and a pool with ch at 3ppm is not unsafe. not even close. the kit is giving you bogus info.
It MAY BE unsafe depending on the CYA level. No one can say what the right level is without the CYA level. Check Ben's best guess table. If you have a standard 30-50ppm of CYA - then a chlorine level at 3ppm is good to keep away algae and kill bacteria in the pool.

Oh - and you can use that kit above 5ppm - just take one part pool water and one part distilled water. Then test - take your results and multiply them by 2. Then you can test to 10ppm with the standard yello OTO test kit.