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Building on the comments from this thread, the good weather forecast, and the current low level of the water table , we're planning to 'sink' our poo tank this coming weekend. Using dry mix concrete. (Thanks J for the advice, we'll do exactly what you did) In recent weeks I've been reading a lot about concrete - and more specifically dry mix concrete. @Bitpipe talks about using up spare cement and and sand: this search provided some very interesting reading. It seems a very versatile mixture, which until recently, i would not have given it any thought. The search above points to all sorts of uses. But without water - how does it go off? Does it just take the water out of the atmosphere? And so that means you can't guarantee when and how fast it sets? Is there a rule of thumb about when to use dry mix instead of wet mix?
