5 microns is fine for me.
Not for well water,but I have a galvanized supply line to my house.
They do rust,internally.
I was getting *clogs *in my shower heads and faucets,so this will help a lot.
There are finer filter ones,but that is not my concern.
Just the larger particles will be enough to filter out the stuff.
I'll use this one in a see-through filter housing to monitor its effectiveness.
I'm not worried about the flow rate at all.
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