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Re Nitrate test kits

Before anyone shouts me down, I've just realised that the units in my last 
post should be mg/l (or ppm) not mg/ml. Anyway it seems that the general 
broad-range nitrate test kits are inadequate for measuring nitrate levels in 
planted aquaria, even within the 'ranges' suggested by Mr. Barr.

Roy Wadey.

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