You can always do the Empty Dishwasher Trick (for those that have Dishwashers). No detergent and run it on it's hottest temp setting. If your DW is not yet waterlogged, this is not the most efficient ... it's really for those that just want to sterilize and release some tannins from the DW.
Hot water's the best way to help water-log it and release tannins as it opens up the pores.
If your not in a huge rush, just leave it in the barrel .. even cold water will eventually water-log it.
75g Planted Barbs Denison, BlackRuby, Tiger, Albino Tiger, Green Tiger, Cherry, Gold, Checkered, Odessa.
NonBarbs Cardinal, Neon, RummyNose, Bloodfin Tetras, Z. Danios. 1RTS. Amano, Bamboo, Ghost & RCS. 20g Long Shrimp Tank RCS, Tiger, Amano.