I have an older vinyl pool and have mostly been able to care for it myself as a senior citizen, but there are things that I can't do so I have to rely on the local pool center for opening, closing, repairs etc. I am starting to lose confidence in the store and service. When they opened the pool they said that I had an air leak and needed to have my 18 month old Multiport valve replaced. Since the sand filter was over 20 years and was shooting sand into the pool, I decided to have it replaced and thought it would solve the problem of the air bubbles. It did not. I did discover that there is another leak coming from the filter. Here is the picture of the leaky joint as well as a foam on the surface of the pool. I sent the pictures to the pool service people since they just installed the filter yesterday, I thought that maybe this should have been checked and or replaced. I am going there tomorrow for supplies and a water check. Any suggestions as to what I should be asking. Once I get this taken care of, I am going to try to figure out the simple chemical solutions on this site as it make a great deal more sense. Thanks in advance - Linda Tuttle