The cartridge is only a month old - the pool and equipment are new. The cart looks like it fits in either way and I've tried it both ways with no difference in the result. We've already had trouble with the pump leaking and I'm really wondering if the pump isn't working well enough to pump the water through the cart. The pump works great without the cart in, but add the cart and maybe the pump can't handle the extra resistance. Does that theory make sense to any of the experts here?

Thanks for everyone's help. I'm way over my head. The PB keeps saying the pump and filter are operating correctly, but if there isn't enough pressure to operate the SWG, there's gotta be something wrong somewhere. I just don't know what.