Effectiveness of dosing systems (against corrosion)

Hello,

I am a new homeowner with an old pipe installation and wanted to hear your assessment of dosing systems that are installed in the basement on the main supply line after the filter/pressure reducer.

So far, we have no extreme problems with rust (water is not brown, except when the main line is turned off). However, small particles accumulate in the aerators, which we have to replace approximately every 2-4 weeks, as it feels like quite a lot comes out. But I am a layman and don’t know exactly what is a lot or a little.

Replacing the pipes is out of the question, so I want to preserve/care for the current pipes as long as possible and recently read about dosing systems (phosphate addition).

My question: Do these actually help extend the lifespan + minimize the small rust particles in the water? Your experiences?

Additionally, we want to install a physical water softening/transformation system in due course, but that is another topic.

Key data:
House built in 1975
Pipes were renewed approx. 1993, presumably galvanized steel
Water hardness: "hard" 21dH
Gas heating

Many thanks and greetings from Bavaria

Hello and welcome

Unfortunately, I cannot tell you anything about such systems.

What I do wonder, however, is why you constantly replace the aerators.
It is sufficient to simply clean them.

Rust or limescale in the aerators?

What I do wonder is why you keep replacing the aerators. It is enough to simply clean them.

Thank you, I meant of course cleaning - not replacing.

It is primarily rust particles, not lime (but as mentioned, the water is not brown or anything).

I am observing the whole thing now and will take a photo every two weeks when cleaning the aerators for documentation.

Can such dosing systems also be installed independently of softening systems/etc., or temporarily "tried out" for a few months? Or are there follow-up issues if the dosing system is removed again? The rust should then reappear since the formed "protective layer" goes away, right?

Does any of you have experience with such dosing systems or [Impfanlagen] that help against rust?