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I've noticed in a few demonstrations on YouTube so far that hardening the concrete powder doesn't work if you're using the last water block in, for example, a 4x4x1 pool. Could this mean that the actual mechanic is that it hardens when water is next to the block, or above etc.? Aepokk (talk) 05:16, 9 February 2017 (UTC)
- Yes, it has be placed in (or fall into) a spot that has water above it or to the side, for it to harden. – Sealbudsman talk/contr 06:41, 9 February 2017 (UTC)