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The first 3 variables are the ones of i nterest. The 'total system' worksheet lays it out quite clearly, youv'e got your hardness, 200 mg/ L (Calcium carbonate) which is on the hard side, pH (~7.5, alkaline) and further down in the nutreients youve got the nitrate content (11.3 not bad)...

Thanks. Yes Peat will soften the water but the way London water is (extremely hard, 18 DH as some people have mentioned) it is cheaper and less hassle to use RO, plus it takes out the nitrates.

Thanks all, I guess the majority are against me here. An RO unit is far too expensive, though I might start using 50:50 RO and tapwater instead to save money (makes measuring it out easier), then gradually reduce it. On the plus side, I have noticed that there are much less scum lines and...

Hello Board, I live in London, to those of you not in London that means limescale on EVERYTHING, alkaline tapwater (average 7.9 but generally around 8.3) and a hardness of 200-300mg/L total. This does not lend itself to beautiful fish (although all the shops keep their stock in tapwater)...