Yes that’s a refurbished from Impros and is why I will never do business with them. It took them 3 tries to refurbish mine and they sent it to me like that and I made them fix it. That “pitting” is actually from cavitation burning away the stainless steel when air bubbles implode. It should be welded and machined smooth.
I only send my impellers to Skat-Trak now. Ask for Glenn.