I am new to this forum so I apologize if I am missing a simple answer. I have a 40x16 in ground concrete pool with 1.5 horse power pump, sand filter, hose solar system, and 4 return jets. I lose about 1 inch a day of water for the second season in a row and have air constantly in the pump. One jet has constant small bubbles coming from it. When I either close the skimmer or use a vacuum hooked to the skimmer the same jet gets large air bubbles. (Sometimes these bubbles may push to 2 other jets, but mainly just the one) Last year I had a pool guy come out and confirm there was no leak at all in my skimmer line. So we plugged the main drain at the bottom and completely disconnected the line thinking that was the problem. (His other choice was to tear everything up, cut the side of the pool out and replace the entire line for $5000-$10000) Started the pool this year and still lose the same amount of water with the same amount of bubbles with the main drain disconnected. (Thank God I didn't go with the $10,000 plan since that wasn't the problem) With understanding there is no problems with my main drain or skimmer line there is still air in the pump. Not just tiny amounts but the water does not reach the lid of the pump. The structure is in great shape with only surface cracks that we repair when closing, and we didn't lose water after it was closed for 9 months. (Canadian winters) We have connected and unplugged the main drain so we have proper circulation.
So if it isn't my main drain, skimmer, or structure, I can only assume my problem is the jets. We are going to re plumb the jet lines above ground and give each jet it's own shut off valve, so we can isolate which one is the problem, avoiding having to dig up all the lines and destroy all the concrete patio around the pool. Two pool guys told me we only needed 3 jets for our size of pool. So here are my questions: 1. Is our plan a valid one or am I wasting time 2.. money? 2. If there has been confirmation that it isn't the skimmer line or main drain why is there still significant amounts of air in the pump?
Could an air leak in the return jet force some air to go to the pump?
Please let me know if there is anything I can clarify. I would love to figure this problem out but am getting frustrated paying for professionals to come out but not find the problem.