Maintaining Manifolds on IPEX/Warmrite/Kitec Radiant Floor System

I purchased a home in 2019 that has a Munchkin boiler tied to an indirect water heater, and an in-floor radiant heating system in tile floors. I have two manifolds, one in the garage that handles the main floor of the house (approximately 3,700 sq ft) with 7 circuits on 5 zones controlled by actuators, and another in the boiler room with 5 circuits on 3 zones controlled by actuators that services the walkout basement area (about 700 sq ft). The in-floor radiant system was unused by the previous owner for 7 years to the best of my knowledge. All manifold valves were in the off position when we purchased the home.

Long story short, I started using the radiant system and have been successfully to date. It seems to be working well, and I have had some other issues with vent leaks and manifold leaks over the years that have been addressed to some degree of satisfaction by a vendor or two that sort of worked on these systems.

As you can see in the pictures below, the fluid in my system is contaminated by something. When I brought things back online, the fluid in the flow meter glass was not clear, but it was not this color either. I am on a well and our mountain water does have high levels of iron in it.

So my question is should I/ can I clean out those flow meters by taking the IPEX manifold apart? I did have one vendor offer to do that for $$$$. I thought that was insane so I passed.

Seeing how the water/glycol mix (I think) is discolored should I flush the system and then replace the fluid with a new mixture? I have one run of pipe that goes up against a wall in our shower and the other side of that wall is the garage so I guess that is why they have glycol in the system. I have used this system continuously during winter for the past 6 years.

What else should I do for maintenance? Is it DIY friendly tasks? Thanks for any advice.