So every time I toggle my two-speed pump from low to high. I get a 20 second dark stream of fine debris from all the pool returns.
After backwashing the filter the stream is less dark but still there. I strangely do not seem to get this problem when the pump is switched on with the high speed toggled.
My Hayward Sandfilter is pretty old, is it possible that the sand needs to be repacked or replaced? or could there be some other problem.
In general, I do feel like my pool needs to be vacuumed more often and while I have no leak, I seem to be slowly losing cyanuric acid levels