I have a 27k in ground with a hayward de filter with a 1hp pump. i have three skimmers in the pool and one return. The flow of the pool is good, it circulates well but the skimmers have suction although i think it is a bit low. Whenever the filter is turned off it loses prime and their is a small amount of air in the pump basket when the filter is on causing bubbles to come out in the return. The pump itself is brand new and i believe that i have some air leaks in the plumbing although no water is seen to be leaking. My question would be what's the best way to check for air leaks in the plumbing and if i can't find any leaks is their going to be any long term damage for leaving things as they are since i have good flow in the return?