Hello. I bought a new Pentair Triton TR60 for my pool. I've plumbed it and all is well, no leaks, pump primes, pump well stays full, flow is good. I have a nagging feeling that I didn't lift up the diffuser when I put the lid on it. I assume the diffuser can de rotated because I read somewhere it could. I can't get the lid off to check. Has anyone had this problem too? Any tricks for removing a stuck lid? Also, pressure reads 8-10 psi while priming, but then drops to zero when filtering under none prime conditions. Any thoughts?