Hi Steve! Welcome -- very nice people on this forum!
I haven't even started on our DIY filter yet. Haven't even opened the box (pump) we bought from you. We started digging our filter pit hole, and then the rains started and have not let up yet. It's like we have another pond, instead of filter pit. I even tossed a couple goldies in it to help with the skeeters until things dry up, so we can start building.