pump was ok until I cleaned mess in pool. after that lost pressure. Changed sand but no luck
one and a half horsepower.
When the pressure on your pump goes up
The only thing that needs to be done before removing the lid from the pool filter is to stop the pump. once the pump is idle there is no presure to speak of.
a leak on a pipe
The pressure increasing indicates that something is blocking the filter.
Probably below 5#'s ???
In most cases a booster pump is used to provide additional water pressure to an automatic pool cleaner , sometimes they are used to provide additional water flow and pressure to a connected spa. A low pressure pump may also be used to pump water through a solar heater.
When the pressure on the filter pump is above 20 psi.
Strainer basket id full or blocked
You will need to backwash the pump, and then rinse out the filter.