I've wondered how these are constructed and how much carbon filter is in them. I cut the ends of this one off with a hack saw. It was in use for one season a couple years ago and has been sitting for at least 18 months, so anything growing in it surely isn't the fault of the filter. I was surprised how much carbon is in the filter. The flow with these is ok, but we've moved to the ClearSource RV filter, which flows more than you can possibly use in an RV.
Flow direction arrow is visible on the label
The input end has a strainer and a quad circle plastic piece that keeps the foam strainer firmly against the granular carbon.
The output end has a plug that fits against the foam so all the water is forced through a second depth filter, probably to remove any tiny pieces of carbon that get past the foam.
The depth filter cut
Foam removed from the input end showing carbon
Foam removed from the output end showing carbon
Flow direction arrow is visible on the label
The input end has a strainer and a quad circle plastic piece that keeps the foam strainer firmly against the granular carbon.
The output end has a plug that fits against the foam so all the water is forced through a second depth filter, probably to remove any tiny pieces of carbon that get past the foam.
The depth filter cut
Foam removed from the input end showing carbon
Foam removed from the output end showing carbon