Unfortunately all power cords are factory attached to the motor to make them waterproof. Move the cord hole above the waterline then you don’t have to seal it?

Thank you for you help. Do you know can our spa maintenance guy put bromine in to keep the water clean like he does for our concrete fountain? The algae is what caused the pump to fail. Would love any advice.

I’ve had some sort of water feature in my last three houses culminating in three at my current house- a koi pond, a small pool, and a larger fountain with a sculpture. My two tricks to make the pump last longer- I always raise the pump off the floor of the pond at least by a brick, this keeps it out of the sediment. I also add black dye which cuts down on the algae. My two decorative ponds end up being cleaned only twice a year (the koi pond is much more frequent maintenance)