What does RO prefilter mean in practice?
The pre-membrane kit usually stops sediment and removes chlorine that could damage the polyamide layer.
When does it matter?
The replacement date also depends on the quality and consumption of water; waiting for the flow to drop will not detect carbon depletion.
Which solutions are related to it?
Applies proper order of cartridges, checks chlorine for carbon, and replaces items by volume and time.