I am about to give up. I have an intex pool, 12x20x4 loaded with algae. It is on the bottom, except when I try to vacuum it the vacuum only works for a few minutes and then no suction. I have tried to prime the hose to no avail. What am I doing wrong. What are the steps to getting the hose primed , the pump running on waste and getting rid of the algae so I can use the pool. Totally frustrated.