Thank you, mas985. During the winter time I've been running the pump at 1500 rpm before I first noticed the issue and then I increased it to 2000 rpm.

In my case, I can't really seem to prime the pump fully. After several attempts to prime the pump, I was able to fill the basket like 95% (The pump lid is divided into several sections and air pockets were formed in each section except for one or two). As time goes on, the air pockets seem slowly getting larger. I attached a pic that I took right after the prime. To achieve that, I had to run the pump at 3000 rpm and also open the main drain only by using that plastic thing you put under the skimmer basket to block the flow from skimmer. Not sure if it is normal to run the pump at that high speed to prime it. Does the fact that I can't fill the basket fully indicate some problems? Or is it actually normal? I don't really remember what it was like when there was no problem.



I didn't really notice air bubbles coming into the pump, but maybe it's because I didn't look at the pump basket too long. I'll check again.

Your theory makes sense to me, although I haven't had this issue for the past two years since it was installed (I also ran the pump at 1500 rpm for the first winter). Maybe it is because the lid doesn't seal as well as before now. So when you say 'VS owners need a high speed run time per day', at what rpm and how long? The initial setting for me was 2500 rpm when the pool vacuum or solar is on and 2000 rpm otherwise. Solar is currently off.

Is there anything else I should try?

Thanks again.