Small ozone system like you ...
Published by Tommy Lin
Small ozone system like you can get for spa and jacuzzi would get rid of this sulfur smell. https://www.spadepot.com/Aqua-Sun-XL-50-Ultra-Long-Life-CD-Ozonator-Kit--120V-P10160C674.aspx?zmam=55673001&zmas=1&zmac=1&zmap=PX7001&gclid=EAIaIQobChMIzKXp1oPe5AIVoyCtBh0SKAamEAQYASABEgJH-PD_BwE