Many woods are buoyant and may need to be soaked to become waterlogged to sink. • Woods may need to be temporarily weighed down to avoid buoyancy by using rocks, anchors, etc until the wood is waterlogged enough to completely to sink. • Woods may release tannins during initial setup. Tannins brings a cognac look to the water, as happens in natural rivers and water systems. You can control the amount of tannins in water by frequent water changes
