You should inspect the O-rings every time a seal is broken. You should remove, clean and grease the O-rings and O-ring grooves as often as required to ensure a good seal and to give you peace of mind. Muck diving or bottom shooting typically demands that you remove and clean the O-ring system every time you open the housing. Shooting mid-water column usually doesn't pollute the O-rings as much. You should replace your O-rings once a year, or immediately if an O-ring is pinched, cut, nicked, or otherwise unserviceable.
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