I am having extreme pain with my Propionate. I am doing 1 and 1/5 cc at 100mg/cc, so 150 mg per shot. we do this 3 times a week...but man My shoulders are hurting so bad I cant hardly hold a bottle of water in my hand. So after reading other posts I have decided my gear needs to be cleaned, and I need to add cottonseed oil. So I am ordering a conversion Kit and some filters. I have a couple of questions...how much can I pass through one filter before I need a new one. Also, is the oil in the conversion kit from arr sterile? If not...how do I do it? Thanks so much guys...