I am new to pools and super frustrated. I have about an 19,000 gallon pool. The old cartridge filter cracked on me some I need to purchase a replacement. I am dealing with a lot of pollen and debris in the pool. I have been told to purchase a DE type filter.....anywhere between 48 and 72 in size. I'm hoping to get some real input from people not trying to sale me what they have on hand. Any suggestions? I am hoping to stay under $1000 if possible since I just replaced the pump with the Pentair intelliflo Variable speed 3hp pump. Thanks.