hmm don't know what to say.

I am using drop/titrate test to check everything except for FC which I am just using a strip.

I am doing the readings twice daily and getting similar results everytime...

If I can i will pull a fresh sample tomorrow and take it elsewhere to see what they are getting for results and post them.

In regards to the sunlight the pool is inddors under a clear roof which blocks about 90% UV will still allowing light...

The pool is an inground 20 X 40 about 41,000 gal with a correct size pump and sand filter.

Any help/suggestions would be appreciated.