Just opening the pool this spring. When I turn on the pump, the pump basket is not filling all the way and the return flow back into the pool is very weak. Checked the hoses and everything seems tight. I put lubricant on the o-ring of the pump basket lid. Any other suggestions or thoughts as to what might be the problem or what to check? Thanks! Got tons of bleach in the pool, but no filter to get the gunk out now.