Can ledge furniture create circulation problems?

[DePixeler]

This was my first full summer thorough a tremendously hot Florida season with great success thanks to TFP. I recently added a couple of chairs to the tanning ledge / Baja shelf. It's obvious immediately that the return flow is deflected by the chairs - but it still circulates (as indicated by the floating thermometer motion). I watch the area by the steps like a hawk as most of us do, and just got to thinking that I may have introduced eddies and voids in the effective circulation that could trap algae.

I suppose I could pull the chairs out after use. I remove them currently, only when I run the robot.

Or maybe I'm just obsessing! Any thoughts?

 

[W.J.Christy]

I have chairs on my tanning ledge. They block the flow a bit, but nothing a little skimming and brushing wouldn't fix.