Came with a PDM 28 filter with a 3” center opening (it’s really 2 78) that doesn’t fit so now I’m stuck with a hot tub I can’t even fill. 

Directions are laughable, they don’t even mention what type of filter to use. If you’re looking for the missing Fig. 1 go to the online manual as it’s missing from the directions that come with the tub. It’s a drawing of the access panel. 

Update Maker does not answer phone and want you to leave a message with the serial number. I guess I will try to order one online and pray for the best.