1 It's more yellowish than the other greens of St. Patrick's Day. 2  Some shade of yellow or Gold is sometimes improperly used in place of the orange in the Irish flag. 3  Gold is the color of the coins in a Leprechaun's pot o' gold at the end of the rainbow. 4  It may be called gold or golden yellow.
If the filter pressure continues to run high with reduced water flow to the pool, the pump may be moving more water than the filter is designed to handle. Check the flow ratings of both the pump and filter to ensure they are sized correctly. You may have a blocked or plugged return line.
I put it down to 'still' water being more susceptible to bacteria growth, expecially in a warm pocket of water somewhere in the pool. Turning the filter on, gets the water moving and allows any bacteria growth to mix with the chlorine! best time of the day to run a pool pump.