I guess this is an old post but from a search could not find much about inline coolant filters.
I have two Jeeps an XJ and ZJ with 4.0L cast iron block. The XJ I installed a Wix bypass type coolant filter on the return heater hose from the heater core.
Due to the 4.0L engine block not being made from alum. there appears to be more iron and metal build up than normal in coolant.
AFAIK both my Jeeps the heater core always has coolant flowing through it as there are no heater core (hose) coolant valve(s) such as some of the older Jeeps have. Heat is controlled through a blend door.
So I suspect using this type of coolant filter with spin on filter is able to filter finer particles down to around 20-25-30 microns.
The inline such as from Champion I with cleanable filter screen because of problems with coolant pressure and flow rate wouldn't be able to filter finer particles.
I e-mailed Champion asking about specs for their inline coolant filtering but haven't hear back from them yet.
Anyway I was wondering if anyone has had any experience with Champions inline coolant filter?
https://www.championradiators.com/product/Filter6461
I'm looking at one on eBay for the ZJ 4.0L that runs approx. $62.00 with free shipping.
or I may just find another filter kit such as from Wix for approx. $37.00 and save a few dollars. I'm fairly certain there's always coolant flowing through heater core as there are no valves to prevent coolant from flowing.
This type of coolant filter, filters a percentage of the coolant over a longer period of time.