So we had our pool built last august and then covered it for the winter. I am now just getting it open for the season and I have noticed that at times the skimmer does not appear to be pulling very well. It is the type without a flapper and a diverter in the bottom below the basket. My question is on the diverter there is a hole with adjustable cover. How open is this suppose to be? When i close it down mostly it seems to make the skimmer work and when its mostly open then it seems to stop pulling.
As shown in this picture I wasn't getting very much pull so when I closed it down it seems to be working better. I just wanted to make sure I haven't changed something that could damage the pump.