I put in my new Kreepy Krauley Suction Side pool cleaner in yesterday for first time and for some reason the pump basket wont fill up all the way when its on. It tells me turn the main drain off but when I do the water level goes down about an inch. Also I have a Variable Speed pool pump and even when I put it on highest rmp it still wont fill all the way up. Is this normal just because it's not pulling in enough water to fill it or something else wrong? And is it okay to run my pump with basket not all the way filled up?