Geo filtering on free and avs sites

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I just wanted to ask you veterans if you filter your sites using geo filtering or will adding some php code to my sites end me up in a blacklist forever.

I have been thinking of using geo filtering on tgp, avs and free sites but thought would ask some people who have alot of years experiance.

I have alot of wasted bandwidth looking at my stats, and could use the redirection to my advantage.

look forward to hearing from you guys