Sorry I didn't get back to anyone - was having trouble logging on and then we were gone for a week. Happy to report that came home to a crystal clear pool - the chlorine level was very high 5.0!

Ok - I actually use both the OTO test kit and a K-2005 at home. The OTO shows plenty of chlorine but the k-2005 says it's low. (I will buy new kits today)

I took my water to two different pool companies. Yes, one used the digital test strips. The other used chemical drops. I am going to take water samples again today.

Both pool companies were telling me that it would be extremely difficult to maintain chlorine because of the phosphate and nitrate levels.

I will report back this afternoon.

Thank you