It's common for sand filters to eject cloudy water for a couple of minutes after being backwashed -- the "RINSE" position is used to avoid this. But I've never seen or heard of a filter ejecting dirty water for 30 minutes.
Could it have been air, ejected because your water level got low? Under certain conditions, air will become dissolved in the water, and then appear cloudy once it returns to the pool. Usually when this happens, there will be a fine layer of bubbles on every surface it the pool. If you are in the pool, it will make your skin feel slick, but if you run your hand over your skin, you'll see tiny bubbles being released and floating to the surface.
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