Hayward SAND FILTER, PRO SERIES "swishing sound head" Questions

hi.i changed the sand &now when the pump runs it sounds like water swishing around in the head of the sand filter is this normal Yes to a degree it's because you are moving more water than before.

My Polaris pool cleaner doesn't seem to have enough force to move it around the bottom very well. There is good water pressure coming from the pump, but the polaris unit will fall over on it's side ...

My P380 moves around the pool but does not pick up debri... My P380 moves around the pool but does not swish the tail around as it goes and doesn't pick up any debri. The pressure control knob at the ...