Hello, I have a 21 000 gallon inground pool that I have a hard time keeping clean. The old Hayward S244T 24in sand filter was replaced with a S220T 22in 2 years ago because I was having problems with sand at the bottom of my pool, thinking the sand filter laterals were cracked. Last year when I open the pool the water was green and it took over 10 days to clear up following the SLAM process. Before I open the pool for the summer, should I consider replacing the sand filter back to a 24in or bigger? My pump is a Hayward Super Pump 1 HP and my pipe size is 1 1/2". Pool has a main drain/skimmer combo and 2 return jets. Thanks