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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@bombcup
Schulman's Insanely Long Water FAQ
and a [TDS]TDS Meter](http://shop.ebay.co.uk/items/__tds+meter_W0QQ_dmdZ2?rvr_id=&crlp=2915949219_228459_228460&UA=WVI8&GUID=9857cccf1210a0e20490ff80ff7c9b18&agid=1395530259&MT_ID=11&keyword=tds+meter&ff4=228459_228460) is a useful tool both for water quality and getting to the bottom of exactly how well you've made your coffee.