Gave the pool a good vacuuming and brushing this weekend, finished yesterday evening. Ah so beautiful- sparkling water on a light blue new liner- pool is only two weeks old. Tested the chemicals after I cleaned, everything is balanced. It has been raining, raining, which is where I thought all the fine dirt on the bottom was coming from- the winds come up and blow dust all around the pool. Well, no rain last night and very little wind (that I know of). Got up this morning and turned on the pump and it was still squeaky clean. Went out a few minutes ago, pump has been running for 6 hours, and there is that fine dirt on the bottom again. It has not rained, and there has been barely a puff of wind, yet there is the dirt. Is it possible that it is coming from the sand filter? How would I tell? I cannot see anything in the water coming from the inlet- it is as clean as the water in the pool, and therefore invisible to the eye. The sand that we put in the filter was a light color, and this dirt is darker, but not sure whether that is relevant or not.