I had a coir block and used it to loosen up some of the ground around here. It worked a treat. I got mine from Amazon. Originally bought it for houseplants but then moved and never got round to using it. It’s great for loosening up unresponsive clay soil.
If I was a Potter my soil would be awesome!!! For gardening……not so much
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Break up the block and put it in a bucket, gradually pour water over and let it settle. You will soon see when it is suitable for use.