I have below ground 20,000 gallons of pool. I opened pool last week with lots of leaves and algae. I started pool and did backwash 2 times. Everything was wokring fine and suddedly pool filter was showing reading of zero. I googled it and found that pool pump may be loosing prime. I added water in pool basket, checked o-ring, make sure all valve on suction side are open without any luck. I also checked pool pump propeller and it is without any debris.
What next? Should I call pool leak finding company. My suction side pipe in under concrete so I want to avoid digging that part. Any help would be appreciatred.