Test interference

[Watermom]

cygnusecks - I fixed your spelling for you. Now do you feel better? (it's the teacher in me!)

[Poconos]

I take the sample from about a foot down in front of the skimmer. If you have a chlorinator or salt chlorine generator or any other chemical thing the chemical levels at the returns can be off. Since I throw all chemicals in the skimmer there is a chance that some stuff can still be dissolving in the sand filter too.
Al