we just started our pool up last wednesday. two days ago and today, we noticed that our sheer descent seems to fluctuate. I walked over to the filter, and noticed that the pressue fluctuates from very low to just about normal. I also see that water in the pump slows and then dramatically increases. I noticed the other day that if I forced the skimmer flap down, that the issue went away. My water level looked good this morning, just above mid-way on the tile. Should I put more water in and take it to 3/4 up the tile?