Several questions and comments based on this thread:
I agree, Dinner support is non existent. I don't understand why they bother to post an email address.
Does anyone know who manufactures Jehmco air pumps for them?
I have researched heavily air pump specs. Personally never had an issue with the Danner air pumps, but when you compare Alita to them, you could afford to replace the no customer service Danner every 5 years and still be ahead.
How much quieter are the Alita compared to Danner? My fish room is getting very noisy?
I apologize for the hijack, but it seemed very related and may help others.