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I could call myself a geologist, i've got a A level in it! I'd look out for any rocks with veins in them, as a white vein which looks like quartz could be calcite, which could have negative effects on water chemistry. Also, I'd stay away from any sandstones, or other fine grained soft...

Ok thank you, sorry if that sounded rude! Its just im in the market for a small heater for my 5 litre pico, and as it has a HOB filter was just wondering what one to get. Thanks again David

quick question, if the hydor is 140mm how is that " a smidge bigger than a credit card"? Thanks