Does testing water immediately after swimming affect Eagle Ray results?

[Emily Perez]

Sometimes I test the water shortly after several people have been swimming. I’m curious whether body oils, sunscreen, or movement in the water might temporarily influence the readings.

 

[Barbara Jones]

Yes, testing right after people swim can make strip readings look a little off because the water isn’t evenly mixed yet and you’ve got temporary effects from sweat, sunscreen, and turbulence that can skew a surface sample. I usually give it 30–60 minutes with the pump running, then I take an elbow-deep sample away from the skimmer/returns so the numbers reflect the pool average instead of a just-used pocket of water.