H
He' s left the building
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plus the lifecycle on the Vario means It is unlikely I am going to have to replace anything....
After each trip, strip the device down and wash out the inside and the filter. Then pump a weak solution of Milton fluid through it, this will stop things growing through the filter between uses.
Don't let the filter freeze (it can damage a wet filter) and try to dry it before storage for long periods, again this will help stop things growing on the filter.