I have checked with the Mares agent here. They have said cleaning the filter as I did is okay, but just keep an eye on performance. I have taken off all the hoses and there is no sign of salt water. I have looked into it from other guys and cleaning a filter is fine. It is simple to remove and insert again with a circlip. The circlip gets a bit bent in the removal even if careful, but is just there to prevent the filter from falling out. One or two scratches on the filter though. I have pressured it up and it is working fine. I do not think it is a major issue to clean in between service cycles.
Finished job.
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Which side of the circlip is facing up, the flat or rounded side?