It's what's inside that counts! A 5 year old Spirovent gets taken apart. See inside a Caleffi Discal

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I'm not sure how putting a plastic media is going to solve the root cause of the problem... which is a PH issue and thus the reason for any copper errosion. A professional Tech should know that, and would address it to protect the rest of the system components!!! Stick to selling and leave the teaching to those that understand ALL ASPECTS of hydronics

mattpefley
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I could not understand what you were saying half of the time

johnbower