Thanks for writing , filled out the information to the best of my ability. Posted a public picassa album with the pictures. https://picasaweb.google.com/1158723...99/PoolSystems

The pump has a slew of numbers on it , serial etc.. None say "Model number" , so I've written them all down ( ones on pump and motor )
SP4010x18NS
ENCLS
SP1610-Z-1-MNS
E44549.

Odd thing , just the slightest air in it now ( running the last 2 hours ) , earlier today went to 1/2 empty and I re-primed after only an hour. The only difference is this time I didn't bleed the air from the filter ( which it is my understanding I'm supposed to do ) . Might be a coincidence, just thought I'd mention it.