If you don’t manage your filters, the analytics you rely on to make business decisions will potentially lead you down the wrong path. You ought to make sure that all non-customers or non-prospects who might visit your site frequently are not being monitored. In most cases, that means asking them for their static IP address or range of addresses.
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Once you have their IP address, login to Google Analytics and go to Admin. Within the righthand column, you’ll see “Filters” (see below):
Now click “Add Filter” – choosing “traffic from the IP addresses”:
If the IP address option won’t work, here is the list of custom filters: