above ground pool w/ Hayward DE 50 filter and a Matrix Pro 1.5hp pump ... installed as a single unit & it is approx 8-10 years old .. am losing prime to pump daily.. can re-prime and runs Ok until it shuts off at days end ... when it restarts the next AM, the prime is lost .. I can open the top of the pump, re-prime, & it starts right up
altho pump filter tank does not completely fill with water ... have checked and replaced the pump filter compartment glass top O ring .. no help ... fill and return lines to pool are underground and do not see any wet spots .. neither pump or filter is showing any leakage ...... how can I find my air leak ???