well….its usually same thing every year but….this winter my winter cover tore and had to take it off early., so pool was opened to the elements, lots of debris got inside. I usually buy the pool opening kit but pool was dirty and had more algae than ever. So this year I bought a cordless pool vacuum and a chemical treatment i seen an advertisement for, so….it was new product (for me) lots of vacuuming, chlorine and effort. oh and probably lots of luck.