question on cooling system

[Stowe, Ted-SEA]

this may sound crazy but I thought I'd ask.

question, in working on my Chevy 350 block, (valve job), I noticed that my
cooling system, (heater core, block) is not pristine. in accidentally
finding some heavy hydraulic web sites, I wondered if anyone has ever
thought of some kind of filter in the heater hoses to trap rust, scale, etc,
rather than letting it flow through the system.

some of the stuff I've seen on the web, (not automotive), has been real
impressive looking, at the very least one might use a patch of clear tubing
and visually see the color/flow/ air content of the coolant, might be
interesting.

thanks, Ted.