I am new (first post). Not sure I'm doing this right....if I'm not....I would appreciate some guidance. I have an in ground gunnite pool (16x34).....Triton 2 sand filter....Hayward SP 1.0hp pump. The pump is brand new, install two days ago.....replacing the exact same model of pump...with no changes in plumbing. I immediately back washed the filter. The psi read 17. My old pump "base" psi was 12. Should I be concerned with the new psi of 17? Seems high. Does that indicate I should not back wash until the psi reaches 27? Any advise is appreciated......thank you.