Greetings all. What a nightmare this has been. Had a suction side air leak. Pool store told me my multiport valve was bad. 150 to replace. I told them I'd have to think about it. Came home found this website. And found all the information I needed. Was not multiport at all. I had pin holes in the hose from skimmer to filter. $11 bucks to fix. Now I see where the pool guy that put my liner in came up with his so called BBB method which I use and it probably cost a 1/3 of what I spent in "pool store" chemicals. Pool is up and running and water looks great...now if it would just heat up. this site saved the day.