Questions about the new Rollei 120 IR film

I would like to shoot some 120 IR film, and have found the Rollei to be the only one available. (The Kodak HIE in 120 offered on the internet is no longer available)

I was going to use an 89b Kodak wratten filter placed in my Hasselblad film back.

Is this the proper filter to use with the Rollei film to get the maximum IR affect?

What ISO should I shoot at with this filter and film to get the max IR affect?

There has been a lot of discussion on the forum on this film, a search of previous postings will be worthwhile.

Here you can also find detailed information:
http://www.digitaltruth.com/forum/viewtopic.php?t=229&sid=951ab62bb099c9fe30b5c2dff8ee05dc

Summurized: 'Best filter' (for max. wood effect) RG715nm and an E.I. for this film and this filter 12-25.

Best regards,

Robert