New pool owner here just getting my feet wet.
I believe this Jandy valve is in the open position for normal operations and so allows water from the filter to return to the pool via the jets and in floor cleaners. If this is true then under what circumstances would I want to isolate the infloor cleaners or return jets?

I believe this Jandy valve is in the open position for normal operations and so allows water from the filter to return to the pool via the jets and in floor cleaners. If this is true then under what circumstances would I want to isolate the infloor cleaners or return jets?
