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No need to disconnect battery when replacing filters.
In between micro filter replacements I use Magneti Marreli air con refresh to condition the system, so you put the air con on full flow at 16C and press re-circulate button with all the vents open, then spray the whole can inside car with door slightly ajar, when can is empty close door (and lock car) for 15 minutes with engine ticking over. Then switch off and open windows for a bit and you're done.
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