The final word on filters for N. America?

[Guest guest]

Okay,

I don't know if there is a " final word " about them, however - unless

my imagination deceives me, I remember reading, not too long ago,

something about filters for dirty electricity.

The Graham Stetzer filters were brought up of course...but then

someone, was it Bill Bruno perhaps? - said something along the lines

of G.S. filters not being ideal for Canada/the US because of the

nature of the dirty electricity we have here - maybe it was that the

filters don't work in a regionally appropriate range? There may have

been mention of something about a sine wave, too. Argh, I can't

clearly recall, now...

But what I'm trying to figure out, is are G.S. filters the best choice

for (in my case) Ontario, Canada, or are other sorts more appropriate,

and what are they?

Also, is the " microsurge meter " that is often sold with the G.S.

filters appropriate for measuring dirty electricity, or is its range

not regionally specific, either? If not, what would be recommended

instead? I know you can use an AM radio, but I like the concept of a

numerical readout, such as which the microsurge meter can provide.

Some clarification would be most appreciated. Thanks!

R.