lol
You've been snookered!
Don't feel bad, most people are by this misleading description. That's my point.
Note: THEY DO NOT say it doesn't contain erythromycin.
If I claimed I do not have a red chevy in my driveway, does that mean I do not have a chevy in my driveway? Of course not.
They claim it does not contain "erythromycin succinate".
I and other chemists stated for many years that this claim was very unusually written. Succinate is not important. Erythromycin comes in other forms and is even approved by the FDA for human use in other forms. Succiante is just the counterion for the positively charged erythromycin. Any negatively charged ion could work in this application.
But that's just informed speculation, here's the proof, as proven in court in Germany:
Having struggled with stubborn red Cyno for a few months I decided to give Chemiclean a go. I've followed the instructions to the letter regarding turning equipment off and performing a large water change, however I still can't run the skimmer 3 days later due to the amount of foam being...
www.ultimatereef.net
In that thread, Claude from Fauna marin states:
"We had in germany a big scandal due to this and the product was analyzed by the veterany office of Hannover
and they showed that this product is erythromycine sulfate .. this is a antibiotics whic normaly only a doctor can give up due to the usage in this case and this ammounts the possibilitly of unwanted resistance is very big"