okay...recently did some cleaning (Floc), and after vacuuming, noticed water level was a bit below what it should be for the skimmer to get enough water...turned off skimmer valve near pump but I'm assuming some air got into system...pump pressure was reading near 30, whereas its usually at a nice stable 10...checked causes/solutions, and I do not have a pressure relief valve on my Hayward (I saw a couple other members with similar sit'ns)...shut down pump, cleaned basket for pump...ran for 5min on "Backwash", 5min on "Rinse", then went back to normal "Filter" setting, but pump pressure is still reading around 25-30...don't notice any leaks anywhere on piping/housing...how to relieve this unwanted air pressure???