"You do have to remove the raw water
pipe to change the belt. And the picture shows that clearly. It's a pity it was designed that way. "
You are correct about the raw water
tube other than I don't think it needs to be removed. Just loosen the hose clamp and remove the bolt from the P clamp and it will easily open a gap large enough to pass the belt through. And looking at the available options, routing it anywhere else would create worse problems. I think it's a small price
to pay for the benifits of the front mount, impeller forward, gear
driven pump arrangement.