I think purigen is rechargeble so price wise it would probably be comparable to a good quality carbon.
Since you can't fully submerge it I wouldn't go too long on any single side. Cook it like a sausage, 5 on this side, 5 on the other then 10 on the first side and 10 on the other should do it. Depending on how well it was cured and the biopotential of your tank water it may take a good amount of time.BigCountry;3106468; said:How long should I boil each side of wood for?