Hi I am new to this site. I have had an Intex 12' - 3' pool for 2 years and I am upgrading to a 15' - 4' Intex pool. I think that the new pool comes with a 1000 gph type A cartridge filter just like the 12' pool. I will now have two 1000 gph Type A filters. Has anyone connected two filters in parallel. I know the flow will not double but the filter area will. I am not sure of the surface area difference between a type A and type B filter. I might just go buy the 2500 B type cartridge filter, cut the new holes before I fill the pool, for $100.00 but money is tight.