Thanks Ozoneman - that's exactly what I thought and have been using -
P.S. I desperately need a really good ozone generator as an air purifier for the house - am so confused with all the machines out there - I don't want the old type "corona" something or other. I read and read but when things get too techy for me it's just too much for me to comprehend - way over my head.
Would appreciate any recommendation before I just take another look online tomorrow and pick what I THINK would be good.