Last year I put a sand filter with the supplied jet on my 15x48 pool. This year I noticed the water level going down. Just found the leak on the jet. The little pc that introduces air into the mix that's on the outside. Have not pulled the air valve off or what ever it's called to see why it's leaking. Is their a o ring in It that may have failed to cause the leak? Also can that be removed and just capped off? I do not use it anyway.. hoping I did not crack it during storage.